9 B
→ thì HTHT + yet : S + havem't / hasn't + VPII + yet
→ dấu hiệu nhận bt : yet
10 A
→ thì QKĐ : S + v-ed / v2
→ dấu hiệu nhận bt : last week
11 B
→ thì QKTD : S + was / were + V-ing
→ dấu hiệu nhận bt : this time last week.
12 B
→ thì HTHT + this is the first time : this is the first time + S have / has + VPII
13 C
→ thì QKHT : S + had + VPII
14 B
→ thì QKTD : s + was / were + V-ing
→ dấu hiệu nhận bt : while
15 B
→ thì QKHT : S + had + VPII
16 A
→ TLĐ + before + HTĐ
17 B
→ thì QKTD : s + was / were + V-ing
→ dấu hiệu nhận bt : while
18 A
→ thì QKTD : s + was / were + V-ing
→ dấu hiệu nhận bt : while
19 B
→ thì HTHT + since : S + have / has + VPII + since + mốc thời gian / thì QKĐ
20 B
→ thì HTĐ ; S + vs/es