As time flies is grammatically correct.
Yes. "The car that just passed was theirs" is grammatically correct.
Thirty Lakhs
Yes, the sentence 'How will you know if you passed it?' is grammatically correct. 'I'm pretty sure I passed my English exam.' 'How will you know if you passed it?' 'I'll find out when I go back to school on Monday.'
yes
it is not. you would have to say, "she passed me a smile" or, "she passed us a smile" and so forth.
The correct phrase is "passed with first class". This indicates that the individual achieved a first-class degree or classification in their academic endeavor.
"They walked past him" would be the correct one
I believe so, for example "I have passed that tree already, I must be lost."
Navigation acts
Navigation acts
You walked past the pole. You passed by the pole.