Help me please

`1.` Weren't

`2.` Took

`3.` Arrived/ Weren't

`4.` Said/ Bought

`5.` Taught

`6.` Started/ Was

`7.` Donated

`8.` Rang/ Invited

`9.` Did you watch

`10.` Was/ Used to

`11.` Did you go

`12.` Wasn't/ Didn't feel

`13.` Spent

`14.` Wrote/ Didn't write

`15.` Were they

`×××××××××××`

`+` `Q`uá Khứ Đơn `-`Động từ thường:

(`+`) S + Ved + O.

(`-`) S + didn't + V + O.

( `?` )  Did + S + V + O?

`+` `Q`uá Khứ Đơn `-`Động từ tobe :

(`+`) S + was/were + O.

(`-`) S + wasn't/weren't + O.

( `?` ) Was/were + S + O?

`-` I/she/he/it/N số ít `+` Was/wasn't 

`-` They/we/you/N số nhiều `+` Were/weren't