Past conditional and time marks

[Palych]

Is it correct to say:

"You would have been informed of that if you had been at home at 3p.m."
"You would have seen it if you had entered the room at 3 p.m."?

[Mister Micawber]

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Yes, those are correct formations.
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_________________
Native English teacher at Mister Micawber's

[Palych]

But is it correct to say:

"He has been at home at 3p.m. therefore he is informed of that"
"He has entered the room at 3 p.m. therefore he has seen it"?

[Mister Micawber]

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No; they are wrong on several counts. You cannot equate the functions of present perfect and past perfect.
.
.
_________________
Native English teacher at Mister Micawber's

[Palych]

Thank you.