1/ buy - bought - bought.

2/ be - was/were - been.

3/ make - made - made.

4/ have - had - had.

5/ see - saw - seen.

6/ eat - ate - eaten.

7/ go - went - gone.

8/ write - wrote - written.

Verb                  quá khứ đơn          quá khứ phân từ

1.buy                     bought                       bought

2.Be                     was/were                     been

3.make               made                            made

4.have                  had                                had

5.see                       saw                             seen

6.eat                       ate                              eaten

7.go                     went                            gone

8.write                  wrote                            written

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