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Which sentence is correct?

  1. Why did you close that and open this?!
  2. Why did you close that and opened this?!

When a verb comes after a conjuction word such as and in sentences like the above question, which form of the verb should be used?

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The first form, Why did you close that and open this? is correct. (The use of both the question mark and the exclamation point together is non-standard, though.)

Interrogative sentences in the past tense are formed by did + unmarked infinitive. It may be easier to see the pattern if you split the question into two sentences:

  • Why did you close that?
  • Why did you open this?
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