Exercise 1: Use the correct form of verbs in brackets.

27. While we (talk) __________on the phone the children (start) __________fighting and (break) __________a window

28. He used to talk to us for hours about all the interesting things he (do) __________ in his life.

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`27` were talking `-` started `-` broke .

`-` Ảnh : 

`28` had done .

`-` Hành động đã xảy ra từ lâu nhưng chưa kết thúc .

`->` QKHT : S + had + v3/vpp + O .

Đáp án:

27.While we were talking on the phone, the children started fighting and broke a window.

→"Were talking": Thì quá khứ tiếp diễn (Past Continuous)

    "Started" và "Broke": Thì quá khứ đơn (Past Simple)

28.He used to talk to us for hours about all the interesting things he had done in his life.

→"Had done": Thì quá khứ hoàn thành (Past Perfect)

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