There's no need to double post. You can just reply to your thread below:
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
vkr60781. "The building was evacuated after they found/had found one suspected thing"Here you can use either. The use of after does not make the use of past perfect mandatory it makes the sequence of actions clear.
vkr6078 some examples where "only past perfect" tense is the grammatical and can not use simple past ? and explain it why if possible.Here are some examples where the past perfect, and not the past simple, is correct.