Выберите правильную форму глагола to be и объяснить почему: 1) i … in the 10 th grade. a) is b) are c) am d) were 2) he … at the theatre yesterday. a) is b) was c) will be d) were выберите правильную форму глагола “to have” и объяснить почему: mr. smith stayed at his office very late because he … a lot of work. a) has b) have c) will have d) had