Look at the picture and use the prompts to write sentences. Use the correct form of the present perfect simple.
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
6 Dave/drop / pen/ on the floor
5 Christine / already / open / book
7 he/not/pick it up / yet
