No, the proper way to word that phrase would be: as the days pass
yes
As I walked passed the post office I was stung by a bee.
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it is not. you would have to say, "she passed me a smile" or, "she passed us a smile" and so forth.
Wednesday morning, it is correct to say I have not seen him for one day. Wednesday afternoon, or by working day end, it is correct to say I have not seen him for two days
The correct phrase is "flew past," which means something moved quickly by.
No. It is correct to say, "He received the letter two days ago."
No, the correct grammar is "He walked past the garden." "Passed" is used as a verb to indicate movement beyond something, while "past" is used as a preposition to indicate movement alongside or beyond something.
"Past" is for things before. "Passed" is to go beyond. It would be correct to say that one's bed-time is in the past, and that one has passed one's bed-time.
The correct phrase is "past experiences." "Passed experiences" is not a commonly used phrase.
Unless "the weekends" is a place you can go to, then no, it isn't correct. It is best to say "On the weekends" if you mean the days Saturday & Sunday.
We use the preposition on to talk about days and dates.E.g. on Friday, on my birthday and/or on 25 Sep 2011.