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

1) Lesson has not started yet. 2) Teacher has already written on the board. 3) Joe and Tim have just come into the classroom. 4) Tony has not finished getting books ready. 5) Christine has already opened book. 6) Dave has dropped pen on the floor. 7) He has not picked it up yet.

Употребляйте Present Perfect, если желаете выразить прошедшее деянье, которое не относится к определённому моменту в прошлом, но имеет итог в настоящем.