Hi,
1.Could you please keep/stay quiet when I study.
Are 'keep' and 'stay' interchangeable here? Is there any difference between them?
Can I use 'while' or 'as' instead of 'when' here? What is their difference if yes?
2.He fainted while he was
excercising.
Can I use 'when' or 'as' instead of ' while' here? Is there any difference between them?
3.He never stays angry for long.
Can I use 'keep' instead of 'stay' here? What is the difference between them?
Thank you very much.