Give the correct form of the verbs in the brackets to complete the sentences
They (study) in the library when the fire alarm (go off)
Giải bởi Vietjack
Câu diễn tả hành động đang diễn ra thì hành động khác xảy ra xen vào.
Hành động xen vào chia ở thì quá khứ đơn. Hành động đang xảy ra chia ở thì quá khứ tiếp diễn.
Công thức: when S was/were + V-ing, S + Ved/V2
=>They were studying in the library when the fire alarm went off.
Tạm dịch: Họ đang học ở thư viện thì chuông báo cháy kêu lên.
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