It's hard for me to understand about past perfect tense. I wrote sentences which the time was messy.
Here are some sentences. -I had been studying in college for a year and I stopped studying. -I realized that I did not touch something hot when I had forgotten how to avoid from the fire. -My friend had met me since I was standing on the sidewalk. -My family had been cleaning the house for all morning and then a visitor came. -I had reviewed Physics since the last two hours.
Top answer
None of those should use past perfect . -- The order of actions is clear, so no past perfect. - - Did she see me eating?
— Mister Micawber
None of those should use past perfect .
-- The order of actions is clear, so no past perfect.
- - Did she see me eating?
The order of event is unclear.
-- Use past perfect if she didn't see me eating.
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I had done my homework when my teacher came in the classroom.-- Good.
My sister had cleaned her room since my mother left for work.-- No: the word 'since' not only orders the two events, but you have also used past perfect for the more recent event; past perfect is used to refer to the earlier event.
Can't think of any offhand. Don't think 'conjunction word'; think about whether the two events are clearly ordered logically or by common sense. If not, use pp.