`37,` A

`->` When + S + V-s/es + O, S + will/modal verbs + V-bare + O

`38,` B

`->` Since + S + V2/ed, S + have/has + VpII

`39,` B

`->` QKĐ: S + V2/ed + O

`40,` B

`->` As soon as + S + V-s/es, S + will/modal verbs + V-bare

`41,` C

`->` many years ago `->` QKĐ

`->` QKĐ: S + V2/ed + O

`42,` D

`->` in twenty years `->` TLĐ

`->` S + will + V-bare

`43,` C

`->` in two days `->` TLĐ

`->` S + will + V-bare

`color{white}{#MPhuc}`

`37. A`

`+` TLĐ when HTĐ

`38. B`

`+` Since QKĐ; HTHT

`+` QKĐ : `( + )` S + V`2`/ed

`39. B`

`+` QKĐ : hành động xảy ra liên tiếp trg qk

`40. B`

`+` TLĐ, as soon as, HTĐ

`+` HTĐ : `( + )` S + Vs-es + ...

`41. C`

`+` DHNB : many years ago -> QKĐ

`42. D`

`+` TLĐ : `( + )` S + will + V-inf

`-` DHNB : in twenty years

`43. C`

`+` DHNB : in two days -> TLĐ