42 arrive
TLĐ + as soon as +thì HTĐ
43 is cooking
thì HTTD : s + be + V-ing
dấu hiệu : at present
44 was wacthing
thì QKTD : s + was/ were + V-ing
45 did -work
thì QKĐ nghi vấn : did + S + V nguyên mẫu
46 is learning
thì HTTD : s + be + V-ing
dấu hiệu : now
47 had done
thì QKHT : s + had + VPII
48 has just seen
thì HTHT + just ; S + have has + just + VPII
49 saw
thì QKĐ : s + v-ed / v2
50 đề có sai ko nhỉ ? ở đây when -> since chứ ?
knew - were - haven't met - left
trước since chia thì HTHT sau since chia thì QKĐ