After he ( do) his home work last night, he (go) to bed. When I ( see) her on the street yesterday, she ( wear) a rosy skirt. He (teach) Maths before he (change) to literature
2 câu trả lời
`1` had done / went
`->` Cấu trúc : After + past perfect + simple past
`2` saw / was wearing
`->` Cấu trúc : When + thì quá khứ đơn , thì quá khứ tiếp diễn
`3` had taught / changed
`->` Cấu trúc : Past perfect + before + simple past
+After he did his homework last night, he went to bed.
Thì QKĐ "last night"
+When I saw her on the street yesterday, she was wearing a rosy skirt.
Thì QKĐ "yesterday"
+He taught Maths before he changed to literature.
S+V_QKĐ+before+S+V_QKĐ
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