Trekkers who are opting for an English speaking nature or mountain guide in Iran should be aware of the fact that the general level of English spoken by many of these guides is not up to the standard they might expect. Cultural guides usually have a better level of English than most nature or mountain guides. The reason many trekkers wish to have an English speaking guide is to interact with the locals more meaningfully and learn about local cultures, however, the English the guides speak may disappoint them. The reason is that English learnt by many of these guides when they undergo training is inadequate and unless they have a strong motivation to take extra lessons their knowledge of the language especially spoken language remains generally low. Besides, many of these guides never get the chance to travel outside Iran mainly because it is extremely difficult to get visas (bar for a few far eastern and middle eastern countries) and also because until recently the number of incoming tourists has been low.
https://www.lonelyplanet.com/iran/alamut-valley/activities/caspian-trek/a/poi-act/1561471/1332347 https://www.lonelyplanet.com/iran/alamut-valley/activities/caspian-trek/a/poi-act/1561471/1332347