Is it alright if I used vernacular language to explain the concept in my English class?

I think it is very much alright, cause anyone can understand better things in their vernacular language only and then they translate things into their required language(English or so).

So explaining things in vernacular language makes easy for people who are learning English to learn it with good foundation, i think so. its my2 cents. People may have different opinions. I just conveyed my opinion on this medium. Thanks.