Can i apply for f1 visa in usa?

You may depending on your eligibility for the student visa and is worthwhile to consult with an attorney to discuss options for change of status.

How to answer question 41 on i-130 form if I am i-360 widow?

Yes you would indicate you received GC through marriage to USC and provide death certificate to establish eligibility to marry.

Can I travel to Puerto Rico. I have asylum attorney ?

You should speak directly with your attorney regarding specifics about four case and questions about travel.

Hey sir i got 221g letter regarding our relationship i submited all the documents to embassy now whats further process.

That is normal and it is unclear what your question is. 221g processing can take months.

Can you give me advice , should I apply my parents immigration before my sister B1/B2 visa???

It is possible that your sisters application will be denied. It may be worthwhile to consult and work with an attorney for guidance.

No this section is not applicable as you are filing under a different category.

How can I correct a mistake I made on my N-400 before my interview?

You can inform the officer at the time of interview of this error.

My boyfriend accidentally missed his scheduled visit with ice, what are the chances they won’t detain him when he goes Monday ?

There is a chance of this happening so best to consult with an attorney re: how to communicate about this missed visit.

If I came to America on a student visa and am about to get expelled. Can I get married and get a green card that way?

Yes you may be adjustment eligible through marriage to a USC despite a visa overstay.

What is the correct answer for 61 and 62 question in I-485 form?

You would indicate accordingly - yes and the second question is based on the likelihood of this happening again.