Hi, can a teacher help me correct?
Do you say : Thanks for your quick answer?
Or : Thanks for your quick reply?
Also,is it : I look forward to meeting you
Or : I look forward to meet you
Thanks for your help
#1: The words can be used interchangeably. "Answer" emphasizes that a reply comes in response to a question, or something similar. An "answer" completes a conversation in some way, whereas a "reply" merely continues a conversation.
#2: "I look forward to meet you" contains a grammatical error. The preposition "to" needs to have a noun object: "I look forward to NOUN". Since "meet you" is not a noun phrase, it is wrong. "To meet you" and "meeting you" are noun phrases. This gives you two grammatical choices, but only one of them sounds good:
"I look forward to meeting you" (good)
"I look forward to to meet you" (the double "to" sounds bad even though it is grammatical)
However, you CAN say
"I am looking forward to meet you".
It works because "to meet you" acts as an adverbial phrase modifying the adjective phrase "looking forward". You can also say
"I am looking forward to meeting you", in which "to meeting you" is adverbial.