English Sentence
No matter how he tried, he could not open the door.
I would have used intentó.
No matter how he tried, he could not open the door.
I would have used intentó.
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.