Yes that is a correct sentence, as long as you have identified who "he" is in a previous statement.
I am present in the office today.Today, I am present in the office.
The correct sentence is: "Three young pretty ladies dropped by the office."
No, the sentence is not grammatically correct. It should be: "I came to your office so many times but I can't find you."
Nope, unfortunately not. This is a somewhat complex formal sentence. The correct structure will be as follows: "It was after reportingin your office that I understood my impulsiveness" It is however still not ideal. Please state in which context you wish to use this sentence...
Usually you would say that you were at the office, but saying that you were in the office is grammatically correct as well (as long as you are technically in the office building). "I am in office" without the word "the" is only correct if you are currently holding a position which expires (like President or Chair).
principal's office is correct
"How are you" is a correct sentence.
Yes, this sentence is correct.
The package from your Japan office arrived yesterday. It contains the documents you need.
You are palpitating. This is a correct sentence.
are you at the office
If it is the office of one nurse, this is correct - nurse's office. If it is the office of a group of nurses, this is correct - nurses' office.