Sos sos sos sos sos простое время надо эти предложения поставить в -; +; ? ; и вопросу wh -we(to do) our homework. + - ? (wh) tim ( to ring) him + - ? (wh) my mother(tobuy)me a book + - ? (wh)

+ We did our homework.
-  We didn't do our homework.
? Did we do our homework?
   What did you do?
+ Tim rang him.
-  Tim didn't ring him.
? Did Tim ring him?
   Who rang him?
+ My mother bought me a book.
-  My mother didn't buy me a book.
? Did my mother buy me a book?
   What did my mother buy me?

+ We did our homework
- We did not do our homework
? Did we do our homework?
Who do our homework?
+ Tim rang him
- Tim did not ring him
 Did Tim ring him?
Who to ring him?
+ My mother bought me a book.
- My mother did not buy me a book
 Did my mother buy me a book?
Who did buy me a book.