Por mucho que intentaba, no pudo abrir la puerta.

English Sentence

No matter how he tried, he could not open the door.

I would have used intentó. :thinking:

Today, I’m not so sure.

Both are grammatically correct. ‘‘Intentaba’’ is used when you are referring to an action that was in progress in the past.

It’s used when referring to a past action without indicating duration.

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