1.The lesson has not started yet
2.The teacher has already written on the board
3 Joe and Lm have just come into the classroom
4 Tony has not finished getting books ready
5 Christine has already opened book
6 Dave has dropped the pen on the floor
7 He has not picked it up yet
+
+
`\text{S + has / have + V_pII}`
`\text{S + has/have + not + V_pII`
`\text{Has/have + S + V_pII`