School ka bara ma English ma like ka

my major is

in conversation, "Hello, nice to meet you. Could you spare for a moment?" is this a correct way to say?

This is Mahender before you. Is this correct?

how did your car break down

when we use of sentence that you are my life saver?

in conversation, " Hello, it was nice talking to you. can we be in touch in future?" is this a correct way to say?

Guess the answer I have a neck ,but no head ,who am I?

when we can say don't mention it..?

Irregular past ko simple past bhi bolte hain?