7F: For the test on the present perfect tense, make sure you know the three forms of these irregular verbs (and especially the 3rd form, which you need in the present perfect tense). You will find them all at the back of your textbook: p. 137-140.

1) think

2) know

3) see

4) go

5) do

6) give

7) meet

8) bring

9) come

10) leave

11) say

12) tell

13) buy

14) stand

15) fly

16) forget

17) drive

18) ride

19) swim

20) eat

21) speak

22) write

23) have

24) be

25) teach