1
Past participle form: understand
2
Past participle form: WRITE
3
simple past form: BE
4
simple past form: BUY
5
Past participle form: KNOW
6
Past participle form: DRINK
7
simple past form: BLOW
8
Past participle form: be
9
simple past form: LEAVE
10
simple past form: EAT
11
simple past form: HAVE