In English, we say, "Who can explain English to me?" Because "me" is the object, you need to precede it with "to". Also the object usually follows everything else, hence "explain English to me," rather than "explain to me English."

In fact Maria didn't mean that. She just wants to find somebody to practice speaking English.

What is your question, Mapus?

Мария, вы просите объяснить вам английский язык.Это как?

Прошу прощения, если я не точно выразилась...Я имела ввиду потренироваться со мной в разговоре)