`o` Cấu trúc:

`@` Thì TLĐ:

`+` ) S + will/shall + V-inf

`-` ) S + will/shall + not +V-inf

`?` ) Will/shall + S + V-inf

DHNB: oh, you look cold, I will close it,...

`@` Thì QKĐ:

`+` ) S + V2/ed +....

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

`?` ) Did + S + V + ...? 

DHNB: Yesterday, ago, last, already,...

`@` Thì HTHT:

`+` ) S + have/has + p.p

`-` ) S + have/has + not + p.p

`?` )  Have/has + S + p.p?

DHNB: Since , for , already ,...

______________________________________________

`21,` took

`22,` will give 

`23,` didn't go

`24,` weren't 

`25,` was

`26,` wrote

`27,` did they study

`28,` did she buy

`29,` saw

`30,` did/play

`31,` bought

`32,` didn't do

`33,` was living

`34,` had

`35,` went

`36,` didn't become

`37,` talked

`38,` did Liz return

`39,` cut

`40,` didn't visit 

`21.` took (last week: DH thì QKĐ)

`22.` will give (next week: DH thì TLĐ)

`23.` didn't go (yesterday: DH thì QKĐ)

`24.` weren't (yesterday: DH thì QKĐ)

`25.` was (last night: DH thì QKĐ)

`26.` wrote (a week ago: DH thì QKĐ)

`27.` Did - study (two days ago: DH thì QKĐ)

`28.` Did - buy (yesterday: DH thì QKĐ)

`29.` saw (last night: DH thì QKĐ)

`30.` Did - play (lats Sunday: DH thì QKĐ)

`31.` bought (yesterday: DH thì QKĐ)

`32.` didn't do (yesterday: DH thì QKĐ)

`33.` was living (This time last year: DH thì QKTD)

`34.` had (last night: DH thì QKĐ)

`35.` went (yesterday: DH thì QKĐ)

`36.` didn't become (in 1990: DH thì QKĐ)

`37.` talked (last Monday: DH thì QKĐ)

`38.` Did - return (last week: DH thì QKĐ)

`39.` cut (yesterday: DH thì QKĐ)

`40.` didn't visit (last Summer: DH thì QKĐ)

`->` Cấu trúc:

`+` thì Quá khứ đơn:

`-` với động từ thường:

`(+)` S + Ved/V2

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

`(?)` Did + S + V?

`-` với tobe:

`(+)` S + was/were

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

`(?)` Was/Were + S...?

`+` thì Quá khứ tiếp diễn:

`-` với động từ thường:

`(+)` S + was/were + V_ing

`(-)` S + wasn't/weren't + V_ing

`(?)` Was/Were + S + V_ing?

`+` Chủ ngữ: I/ he/ she/ it/ N(số ít) `->` tobe "was"

`+` Chủ ngữ: They/ we/ you/ N(Số nhiều) `->` tobe "were"

`+` thì Tương lai đơn:

`-` với động từ thường:

`(+)` S + will + V

`(-)` S + won't + V

`(?)` Will + S + V?