1. watched  / had finished

GT:      QKHT + Before/By the time + QKĐ

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2. had eaten  /  gone

GT:       QKĐ + after + QKHT

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3. had done  / gone

GT:      QKHT + Before/By the time + QKĐ

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4. listened  /  had drunk

GT:       QKĐ + after + QKHT

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5. hadn't put  / occurred

GT:      QKHT + Before/By the time + QKĐ

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6. had repaired  /  came

GT:      QKHT + Before/By the time + QKĐ

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7. didn't use

GT:      Before/By the time _____, QKĐ
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8. gone  /  had eaten

GT:       QKĐ + after + QKHT

`1.` watched;had finished

`+`Before+S+V(qkđ),S+V(qkht)

`2.` had eaten;went

`+`After+S+V(qkht),S+V(qkđ)

`3.` had done;went

`+`Before+S+V(qkđ),S+V(qkht)

`4.` listened;had drunk

`+`After+S+V(qkht),S+V(qkđ)

`5.` hadn't put; occurred

`+`Before+S+V(qkđ),S+V(qkht)

`6.`  had repaired;came

`+`Before+S+V(qkđ),S+V(qkht)

`7.` didn't use

`+`by the time 1990s: quá khứ đơn

`8.`went;had eaten

`+`After+S+V(qkht),S+V(qkđ)

`-`Cấu trúc qkđ với động từ thường:

`(+)`S+Ved/V2

`(-)`S+didn't+V(B.I)

`(?)`Did(not)+S+SV(B.I)?

`-`Cấu trúc quá khứ hoàn thành:

`(+)`S+had+Vpp

`(-)`S+had+not+Vpp

`(?)`Had+S+Vpp?