Вставьте модальные глаголы can,could,may,might,must.
1.You ... visit your friend soon.
2. We ... do it yesterday.
3. I ... not understand the English language.
4.If you want to be a student you ... work hard.
Cрочно!) 

1. You may visit your friend soon.2. We could do it yesterday.3. I can not understand the English language.4. If you want to be a student you must work hard.