"5 years" term in the N400

It means 5 years back from the date you file your N400.

Can I come to USA under my current visa (B1/B2) change it to E2-Visa without leaving US ?

Yes it is possible to change status through USCIS to E2, however you will not have an E2 visa in your passport and when you depart the US your E2...

Would expunging the case, help me for "Removal of Conditions"/"Permanent Greencard" ?

Your arrest will be revealed to USCIS from your background check and it will want you to provide records to show how the case was resolved, and...

Citizenship interview?

There are instructions on your interview notice about requesting another date.

Hi, I am a lawful permanent resident and I have lost my green card,

You should read the instructions for the i90, on USCIS.gov website. They are very helpful.

II have been convicted of misdemenaour class 1 for shoplifting in usa. Will I not be given visa for other countries?

It depends on the laws of the other countries. You should assume it likely that the other countries will be aware of your criminal history. An...

Marrying a US citizen

Your overstay will be forgiven but you cannot travel until you have your green card in hand - do not leave the US until you have your green card. ...

Unless USCIS asks for original, send COPIES ONLY.

My wife has a green card. I work in China and she stays with me. The agent we met when she entered the usa the first time said

Your wife should naturalize to US citizenship as soon as she is able. US citizens may remain out of the US for an indefinite time. She should...

I have my N400 interview in a week. I have a question regarding address change.

You should not worry about this. Yes, you (and the sponsor on the I-864) are supposed to advise USCIS of address changes, however failure to do...