46. Despite the cold weather, they decided to go for a picnic.

-> Despite+N/N_Phrase/V_ing, S+V+ ______ . 

47. This is the first time I have read this book.

-> This is the first time+S+have/has+PII.

48. Their projects haven't been finished by them.

-> S+haven’t/hasn’t+been+PII/_ed+(by + O)

49. He was so tired that he went to bed early. 

-> S+V+so+adj/adv+that+S+V+ ______ . 

50. He enjoys reading English books.

-> S+like/love/enjoy/... // likes/loves/enjoys/... +V_ing+ _____ . 

46.Despite the cold weather, they decided to go for a picnic. Despite+phrases noun/V_ing

47.This is the first time I read this book. Có Before(chưa làm việc đó trước đây)->đây là lần đầu tiên

48.Their projects haven't finished by them. Chuyển thành câu bị động : S+V+O->S(o)+Ved/V2+by So

49.He was so tired that he went to bed early. Cấu trúc so...that

50.He enjoys reading English books. Enjoy+V_ing