Which sentence is correct?
- Why did you close that and open this?!
- 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: