3.Kate didn’t go to bed early last night; that’s why she got up late in the morning.

=> If Kate ___had gone to bed early last night, she wouldn't have gotten up late in the morning____

4.As he came late to work last week, the boss fired him.

=> If he __hadn't came late to work last week, the boss wouldn't have fired him.____

5.As you didn’t lock the door yesterday, the burglar got in.

=> If you __had locked the door yesterday, the burglar wouldn't have gotten it._

If Kate had gone to bed early last night , she wouldn't have got  up late in the morning.

If he hadn't come late to work last week, the boss wouldn't have fired him.

If you had locked the door yesterday, the burglar wouldn't have got it

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  If -clause ( Mệnh đề điều kiện) Past perfect (If  + S + had + V‑3 / V-ed)

  Main clause( Mệnh đề chính)  Future in past (S + would     have + V‑3 / V-ed)