1. She pretended not to know me. - She looked as if she................... 2. He should call me on the phone. - It's tine..................... 3. We must start working now. - It's high time...................

1. She looked as if she hadn’t known me. (Câu giả định không có thật ở quá khứ: S+V+as if+S+had+V3/ed+O)

2. It's time for him to call me on the phone. (It's time+(for sb)+to-V: Đã đến lúc ai đó phải làm gì)

Hoặc: It's time he called me on the phone. (It's time+S+V2/ed(QKĐ))

3. It's high time we started working now. (Như câu trên, nhưng mang nghĩa "khẩn cấp, cần thiết" hơn.)

Hoặc: It's high time for us to start working now.