Составьте предложения в present perfect. 1) lesson/not/start/yet 2)teacher/already/write/on the board 3)Joe and Tim/just/come/into

Present Perfect - вспомогательный глагол have (I, we, you, they) и has (he, she, it) плюс основной глагол в третьей форме (правильный глагол с суффиксом ed).1) The lesson has not started yet. 2)The teacher has already written on the board. 3)Joe and Tim have just come into the classroom. 4)Tony has not finished getting the books ready. 5)Christine has already opened the book. 6)Dave has dropped a pen on the floor. 7) He has not picked it up yet.