1. It was only when he came into the room that I recognized him.
2. Had it not been Laura's report , I wouldn't have been able to finish the project.

1. It was only when he came into the room that I recognized him.
2. Had it not been Lan's report , I wouldn't have been able to finish the project.

1. I only recognized him when he came into the room
-> __________It was not until when he came into the room that I recognised him___________(câu này theo mình dùng not until)
2. Thanks to Lan's help, I was able to finish the project
-> ___________Had it not been for Laura's report , I wouldn't have been able to finish the project________ (Câu này 2 bạn trên thiếu "for" phải có for nha)
* Bạn có yêu cầu giải thích nên mình gt luôn:
Câu 1: Cấu trúc It was not until when + a clause+that : Không cho đến tận khi... thì...
Câu 2: Đây là đảo ngữ của câu điều kiện loại 3: Had +S +PII, S + would/ could/... + have + PII
Còn theo như câu trên, nó k theo cấu trúc mình viết, mà nó dùng theo danh từ (chủ ngữ giả) thì dùng had been for + N

2. Thanks to Lan's help, I was able to finish the project
-> ___________Had it not been for Laura's help , I wouldn't have been able to finish the project________ (Câu này 2 bạn trên thiếu "for" phải có for nha)
help nhé. sửa cho bài trên nên viết lộn luôn 

1. I only recognized him when he came into the room
->It was only when he came into the room that i recognized him
2. Thanks to Lan's help, I was able to finish the project
->Had it not been Laura's report , i wouldn't have been able to finish the projec

1. It was only when he came into the room that I recognized him.
2. Had it not been Laura's report , I wouldn't have been able to finish the project..