Làm quá khứ đơn hoặc quá khứ tiếp diễn: 1) The children ... (play) football when their mother ... (come) back home. 2) The bell ... (ring) while Tom ... (take) a bath. 3) I ... (be) very tired because I ... (work) all day yesterday

Làm quá khứ đơn hoặc quá khứ tiếp diễn
1. The children ... (play) football when their mother ... (come) back home.
2. The bell ... (ring) while Tom ... (take) a bath.
3. I ... (be) very tired because I ... (work) all day yesterday.
4. He ... (sit) in a cafe when I ... (see) him.