Sunday, March 26, 2017

grammar - Is it grammatically correct to use two past continuous tenses in a single sentence?


This question just suddenly somehow popped up in my mind.


Usually what I encountered in a sentence is in the pattern "past tense + past continuous"


E.g.:



I was doing homework when my mum came back.



I would like to know whether it is grammatically okay to use two past continuous tenses in one sentence?


E.g.:




I was laughing so hard when I was watching the video.





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