`3)` Did Walter call us?

`->` Did + S + V-inf ... ?

`4)` Did you see the picutre?

`->` Did + S + V-inf ... ?

`5)` Did your parents get the letter?

`->` Did + S + V-inf ... ?

`6)` Does it rain a lot?

`->` Do/does + S + V-inf ...?

`->` it là số ít `=>` does

`7)` How often do we sing the song?

`->` How often + do/does + S + V-inf ... ?

`8)` Did Maureen watch the film?

`->` Did + S + V-inf ... ?

`9)` How many books has Bob read?

`->` How many/much + N + have/has + S + V3 ... ?

`->` books là DT đếm được `=>` many

`->` Bob là số ít `=>` has

`10)` Have you ever been to London?

`->` Have/Has + S + ever + V3 ... ?

`->` you đi với have

@magnetic

`3.` Walter is calling to us

`4.` Have you ever seen the picture?

`5.` Did your parents get the letter last week?

`6.` Is it raining a lot ?

`7.` How often do we sing the song?

`8.` Maureen has watched the film

`9.` How many books has Bod read?

`10.` Have you been to London?

`***` Thì HTHT:

`(+)` S + have/has + V(2)

`(-)` S + have/has(not)+ V(2)

`(?)` Have/has + S + V(2)