I see on examples that we can use by with past, past continuous or past perfect
Example :
By 2000BC, people had invented....
BY 2000BC, people were using...
If the first one is correct, shouldn't wr say
By 200bc,people had been using?
remyzero By 2000BC, people had invented.... BY 2000BC, people were using... If the first one is correct...
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remyzeroBy 2000BC, people had invented.... BY 2000BC, people were using... If the first one is correct...
It is.
remyzeroshouldn't wr sayBy 200bc,people had been using?
You can say that also. All are possible in appropriate contexts. I am more concerned with your many other typing mistakes. Please proofread befo