Everyone helps me to correct this speech !! (about punction , semi , and how to use words . I am vietnamese S"?

One of the most difficult communication problems for Vietnamese students is "Speaking". Most people find "Speaking" very difficult to do. First of all, they lack an adequate vocabulary, and their pronunciation is poor, which means that the native speaker cannot understand what they are trying to say. Secondly, when Vietnamese students study a language, they do not learn enough about "Phrasal Verbs and Idioms", which are very important. For example; the other day a guy said to me, "Hey! Look out! The car!" I could not imagine what he meant. I just thought that I was supposed to "look at" the car. Vietnamese students always use their hands to express themselves when they speak, and it can be confusing. To conclude; Vietnamese students have communication difficulties when it comes to "Speaking".