(a) and (b) are both correct but have slightly different meanings. (a) When/As I was entering the room, I saw a snake. (b) After I had entered the room, I saw a snake.
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mrmanshubhamsir please explain where to use all the other option and elaborate each example so that it can be clear to meI have already done that.
mrmanshubham please explain where to use all the other optionCB has explained that the other options are ungrammatical and cannot be used anywhere.