Đáp án:
41. It has rained an hour ago
- has + V3/ed
42. The last time we visted my grandfather was two moths ago
- The last time + S + V-ed/VPP
43. In Vietnam, April is hottest than any other months of the year
- hotter → hottest
44. Vinh is always forgetting his homework
- keep doing something <=> be always + V_ing
45. Do you mind helping me put the chairs away?
- Would/Do you mind + (S) + V-ing