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This article aims to study the modal elements equal to bɑjæd in Persian, meaning ‘must, should, and have to’ in some West Iranian languages, including Balochi, Gerashi, Gilaki, Hawrami, Kahangi, Kurdish, Lori, Persian, Semnani, Tati and Vafsi. It also presents the semantic map of these expressions beside a categorization of these languages based on a modal element. The investigations have indicated that some of these languages (Balochi, Bamposht dialect and Hawrami, Hawraman Takht dialect) use adverbial modals to express these notions, while as least in one case (i.e. Kahangi), there are two distinctive auxiliaries which signify ‘must, have to, and should’. Moreover, classification of these languages, according to a semantic feature, ends in a continuum on which languages are laid next to each other, where some of them are closer to some languages and further from the others; this is against the traditional categorizations which are mostly based on morpho-syntactic features, in which a language is whether a member of a group or not. Moreover, all the targeted elements, (expect one of the modals in Kahangi, i.e. ɢɑde) besides deontic (necessity and possibility) and epistemic modality (possibility type), express participant-inherent need, participant-imposed necessity and situational necessity, as types of dynamic modality.
           
1. Introduction
In the languages of the world, words (mostly auxiliaries) meaning ‘must' are primarily used to convey deontic modality. Modality is usually defined as those semantic modifications that the speaker uses to talk about his thoughts and beliefs about a state of affairs or SoA (Nuyts 2005, Butler 2013). In Iranian languages bajad (and its equivalents) meaning ‘MUST’, is the main language element to indicate necessity and possibility.
This paper studies 11 Iranian languages choosing from Rezaei Baghbidi's classification (2009): Balochi (Bamposht), Gerashi, Gilaki (shaft), Hawrami (Hawraman takht), Lori (Balagariveh), Kahangi, Kurdish (Sorani), Persian, Semnani, Tati (Takistan), and Vafsi. It discovers the modal elements meaning ‘MUST' and specifies their modal domain. The article seeks to provide a semantic map, following Van der Auwera and Plungian (1998), using one modal notion, i.e. ‘MUST'. Ultimately, based on this semantic feature, it presents a language categorization to verify how this categorization varies with current classifications which have syntactic considerations.
 
2. Literature Review
Among many studies on modality, Akhlaghi (2007), Taleghani (2008), and Rezai (2009) study modality in Persian. Following Palmer (2001) they conclude that modal auxiliary bajæd expresses deontic, dynamic and epistemic modality.
In case of other Iranian languages, Moradi (2012) studies modality in Sorani Kurdish from a semantic and syntactic perspective and Naghzguye Kohan and Naghshbandi (2016) investigate modality in Pavehi dialect of Hawrami.
 
3. Methodology
This study applies a questionnaire including 200 situations and 82 sentences to collect the data. The questionnaire was conducted in the interviews and the informants were asked to use modal elements to complete the situations and translate the 82 sentences in their own languages. The data has been transcribed in IPA, checked with the speakers, glossed with Leipzig glossing rules, and analyzed.
 
4. Results
Our study shows that the expressions meaning 'MUST' in the languages of our concern, convey those domain of modality which following Nuyts (2005, 2006, and 2016) can be summarized as in Figure 1. This figure is the semantic map suggested by Van der Auwera and Plungian (1998). Their terminology has been converted to Nuyts:
 
Figure 1: Semantic map of ‘MUST’ in Modern West Iranian Languages


The article is also an effort to categorize these languages based on a semantic feature, namely modality. Applying the typological notions of continuum and number, we may not be able to present a clear-cut category, but we can provide a continuum in which some languages are closer to the others comparing with the rests. Figure 2 is the result of such a try:
 

 
5. Discussion
The first issue to discuss here is to discover the modal elements which are used to express those semantic notions meaning 'MUST'. Our investigation shows these elements are mainly auxiliaries; however, in two of languages of our concern, i.e. Hawrami and Balochi, these are the adverbs which indicate necessity and possibility. These elements are as follows: pejke (Balochi), bɑæd (Gerashi), va/vas(t)i (Gilaki), pʃo (Hawrami), ɢɑde and be-ɡu/be-ɡɑ (Kahangi), æʃe/æʃjɑɛ (Kurdish), boæd/mije/mijɑst (Lori), bɑjæd (Persian), mɛ-ɡi/mɛ-ɡijɑ (Semnani), mo-ɡo/mo-ɡosti (Tati), ær-ɡo/ær-ɡoɑ (Vafsi).
To illustrate the type of modality these elements express, we apply Nuyts' (2005, 2006, and 2016) classification in the category of modality. In this sense, these modal expressions are used to talk about a) absolute moral necessity and desirability (as subcategories of deontic), b) epistemic probability, c) participant-inherent, participant-imposed, and situational (as subcategories of dynamic modality). In Kahangi, two modal auxiliaries meaning 'MUST', these roles are divided between these elements, and they don’t get close to each other's realm.
 
 
6. Conclusion
Our study shows categorizing languages based on a semantic feature does not provide us with an absolute boarder. Rather, we can judge the languages in a continuum that shows how closer or further each language is to the other members. Hither, Hawrami and Balochi, applying modal adverbs, are closer to each other comparing to Kahangi with two auxiliaries for the same purpose.
 
Acknowledgments
We would like to thank all the informants who kindly and patiently participated in numerous interviews in the process of data collection. We appreciate their concern and love for their mother languages

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In this study, a comprehensive assessment of the occurrence and spatial distribution of heavy metals including Nickel, Lead, Zinc, Copper, Cadmium and Chromium, as well as, TPHs in the surface sediments of the coastal areas and far from the coast of the Persian Gulf in Bushehr and Khuzestan provinces were performed to identify the possible sources of sediment contamination and determining the degree of pollution. Eight pollution indices were used to evaluate the quality of sediments in terms of heavy metal and TPH pollution. The investigated areas could be distinguished by a significant degree of heavy metal pollution of Nickel, Cadmium and Zinc. High concentrations of Nickel and Zinc were observed in stations around Nakhiloo, Bushehr. The comparison of average pollution indices between regions showed that both Bushehr and Khuzestan provinces, respectively, with the average of contamination degree (CD) (20.25 and 22.11), modified contamination degree (MCD) (3.38 and 3.69), pollution load index (PLI) (31.17 and 57.57), potential ecological risk index (PERI) (353.54 and 349.39) have a significant degree and risk of Nickel and Cadmium pollution, especially in Nakhiloo area, Bushehr. Investigating the spatial fluctuations of the concentration of TPHs in two provinces showed an increasing trend from Bushehr to Khuzestan. However, areas were located in no pollution or low pollution zonation and were safe from the adverse biological effects of TPHs. Comprehensive and impressive strategies to control and reduce these pollutions, especially in polluted areas, should be considered, so that the sources of these pollutions be managed.
 

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The use of Artificial reefs(A.Rs) are one of the methods used to rehabilitation of fish stocks. This involves studying the grain size composition of bed sediments and  Total Dissolved Solids (TDS), which are crucial components in terms of their location. For this purpose, three stations with three repetitions were selected in the eastern and western of Jask City Bay and the study was conducted in the summer and winter seasons of 2023.In the study of total suspended solids, the minimum value with the mean and standard deviation was 25.9±0.46(mg/lit)at the fourth station in the Eastern basin during winter 2023. The maximum value with the mean and deviation was 36.39±0.62( mg/lit )at the third station in the western basin during summer 2023. The analysis of sediment grain size in the stations revealed that the lowest and highest amounts of sand and silt were found in the western basin at 76.4% (third station, summer 2023) and 88.5% (second station, winter2023) respectively. Firstly, the strength of the substrate (grain size) is the most essential factor in establishing structures, which contributes to ecological and biological success. Considering the optimal range of this component stations, suggested as the suitable areas for installation of A.Rs, one area(Western of  Jask City Bay) and two area(Eastern of  Jask City Bay), respectively.