Viết lại câu: `1,` I'm obliged to finish the letter before midday `->` I have to `2,` She said to us: "Don't be late again" `->` She told `3,` It started to rain at `2` o'clock `->` It has

Đáp án:

1. I have to finish the letter before midday.

- tobe obliged + to do st: bắt buộc làm gì

- have to do st: phải làm gì

2. She told us not to be late again.

- tell sb (not) to do st: bảo ai (không) làm gì

3. It has rained since 2 o'clock.

- started + to do st: bắt đầu làm gì

- has/have + PII + since + mốc thời gian: làm gì kể từ lúc nào