41. My mother can cook better than my sister.

→ so sánh hơn: S + V + Adj/Adv + er + than + S

                                   + more + Adj/Adv

- ở đây ta có so sánh hơn của well là better nên ta không cần áp dụng công thức

42. Unless she cleans her house every day, her house will be very dirty.

→ Unless = If not

43. In spite of the fact that he dranks a lot of water, he sill felt thirsty.

     In spite of drinking a lot of water, he sill felt thirsty.

→ Although/Though/Even though + S + V, S + V: Mặc dù ... nhưng ...

= In spite of/ Despite + the fact that + S + V, S + V

= In spite of/ Despite + N/V_ing, S + V

44. Lan asked Nam how he was making arrangements for his summer holiday that year.

→ S + asked + (O) + wh/h + S + V(lùi thì): câu gián tiếp dạng wh/h question

45. He hasn't gone to the cinema for two years.

→ S + (last) + V2/ed + time + ago: Lần cuối cùng làm gì

= S + have/ has +not + V3/ed + for + khoảng thời gian

=>
41. My mother can cook better than my sister. ( cook là động từ -> so sánh hơn trạng từ better than)
42. Unless she cleans her house every day, her house will be very dirty. (Unless = if...not)
43. In spite of drinking a lot of water, he still felt thirsty. (In spite of N/Ving = although S V)
44. Lan asked Nam how he was making arrangements for his summer holiday that year. (câu tường thuật dạng WH-questions -> lùi thì, HTTD -> QKTD)
45. He hasn't gone to the cinema for two months. (thì HTHT have/has V3/ed, for + khoảng time)