37. is
38. was driving
39. haven’t met
40. will be doing
is---was driving--haven't met--will be doing
37 : Is
→ Learning English is interesting : Học Tiếng Anh rất thú vị
38 was driving
→ Ta chia thfi QKTD : S + was / were + V-ing
-> ` While + S + was / were + V-ing , S + v-ed / v2
39 : haven't met
→ Ta chia thì HTHT + since : S + have / has + VPII + since + 1 mốc TG / QKĐ
→ DHNb ; since lats year
40 : will be doing
→ Ta chia thì TLTD : S + will + be + V-ing