1) Before I went home, I a) had checked that everything was ok. b) checked that everything was ok. c) checking that everything was ok. 2) I called her, a) after I had arrived home. b) after I arrived home. c) after I arrive home. 3) They had studied the simple past, a) before they studied the past perfect. b) Before they had studied the past perfect. c) before they were studying the past perfect. 4) When I got back home, a) the kids had already fallen asleep. b) the kids had already fell asleep. c) the kids fellded asleep. 5) I went to the library after a) I had verified the book codes. b) I verified the book codes. c) I was verifying the book codes.

Simple past vs past perfect

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