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Verified answer
Present perfect+ he has stood there since he came
- he hasn't stood there since he came
? has he stood there since he came?
pre perfect cont.
+ he has been standing there for hours.
- he hasn't been standing there for hours.
? has he been standing there for hours?
Past perfect
+ he had stood there before you came
- he hadn't stood there before you came
? had he stood there before you came?
past perfect cont.
+ he had been standing there for hours
- he hadn't been standing there for hours
? had he been standing there for hours?