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?


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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