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Write the third form of the verb.
1. be-...
2.sit-...
3.write-...
4.know-...
5.do-...
6.go-...
7.swim-...
8.break-...
9.take-...
10.buy-...
11.fly-...
12.drive-...
13.run-...
14.make-...
15.see-...
16.eat-...
17.buy-...
18.drink-...

1 been 2 sat3 written 4 known 5 done6 gone7 swum8 broken 9 taken10 bought11 flown12 driven13 run14 made15 seen16 eaten17 bought 18 drunk