1) I want to know, is it possible to go out by now? 2) I want to know if it's possible to go out by now? 3) I want to know whether it's possible to go out by now?
Top answer
"possible to go out by now" doesn't sound right. You may mean "possible to go out yet" or "possible to leave yet". Ignoring that aspect ...
— GPY
"possible to go out by now" doesn't sound right.
You may mean "possible to go out yet" or "possible to leave yet".
Ignoring that aspect ...
(1) is perfectly intelligible and probably commonly used, but it is slightly imperfect in my opinion.
(2) and (3) are OK but do not need question marks.
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