Составьте предложения в present perfect. 1) lesson/not/start/yet 2)teacher/already/write/on the board 3)Joe and Tim/just/come/into the classroom 4)Tony/not/finished/getting/books ready 5)Christine/already/open/book 6)Dave/drop/pen/on the floor 7) he/not/pick it up/yet

The lesson hasn’t started yet.

The teacher has already written on the board.

Joe and Tim have just come into the classroom.

Tony hasn’t finished getting his books ready (yet).

Christine has already opened her book.

Dave has dropped his pen on the floor.

He hasn’t picked it up yet.