刘老师已经给你了很清楚的解答，但你仍不罢休，硬要分个类，这说明你的学习和归纳能力都有待提高。对于网友的这个问题，首先要说明的是，Nice to meet you（美式）是 It is nice to meet you 的省略（形容词也可换成good），而 Glad to meet you（英式）是 I’m glad to meet you 的省略（形容词也可换成pleased）。网友要对初次见面用什么，初次见面后分手时用什么等作个分类，我试图帮你分类如下：

(1) 初次见面时可用（不定式用一般式）：

正：Nice / Good to meet you.

正：Glad / Pleased to meet you

正：It’s nice / good to meet you.

正：I’m glad / pleased to meet you.

(2) 初次见面后分手时可用（不定式用完成式或用动名词，也可通过it was的过去时态来体现，或同时使用it was与不定式完成式或动名词）：

正：Nice / Good meeting you.

误：Glad / Pleased meeting you. (glad, pleased后面不能接动名词)

正：Nice / Good to have met you.

正：Glad / Pleased to have met you.

正：It was nice / good to meet you.

正：It was nice / good meeting you.

正：It is nice / good to have met you.

正：It was nice / good to have met you.

误：I was glad / pleased to meet you. (虽然到了分手时，但“高兴”的状态仍不能视为过去)

(3) 见面和分手均可用的表达主要是：

Nice to meet you.

根据新出版的一些英语词典，Nice to meet you 也可在初次见面后分手时用，比如麦克米伦对Nice to meet you的用法说明就是：[spoken] used for greeting someone when you meet them for the first time, or for saying goodbye to them on that occasion.