Why do one need to write a word 到 in statement 我很高兴见到你? Can we omit it?
It's like being complete without that word for me. Why do we need to use it?
I found this phrase in this book.
Verbs like 见、买、吃、看、听 are all just express an action, when you want to express the result of the verb, you have to add “到”. You will understand it better from the following examples:
It's because of the distinction between 见 and 见到. 见 only means "to look" whereas 见到 means "to see".
我很高兴见到你 roughly translates to "I'm happy to see you". If you omit the 到 you'll get "I'm happy to look at you", which is obviously not what you mean.
This is confusing because the English word see is sometimes used as look and sometimes used as look and see. For example, "I'm going to see her" in Chinese would be 我要去见她. In Chinese however there's a strong distinction between the action "to look" and the result "to see". This confusion is also the origin of the phrase look-see, which came from Chinese/English pidgin.
我很高兴见到你。or 见到你很高兴。 This sentence is the kind of too English. In normal life, Chinese people rarely say it like this although it is good to say. We say, 久违了,久仰了 or simply 你好， in the first meeting to someone.
Back to 见到 or 见， because you have to show respect to the one you are meeting, so you have to make the sentence more complete, 见到 is more complete than simply 见，and more respectful. So unless the one you are meeting are begging for meeting you, please use 见到 not 见.
As a Chinese, I'd like to say that you don't need to pay too much attention to grammars, for Chinese isn't a language like eurpean ones depending on syntaxes, variable genders, plurals……ect. Chinese is a language with a lot of meanings in different kinds of situations:
In your sentence, “见到” doesn't mean I've seen you (past tense or present participle tense), This is ONLY a spoken greeting statement to say "Nice to meet you". This is a fixed phrase without a concept of time,space……ect. So just like "nice to meet you", "nice to see you", we don't care about "I won't be happy unless I see you"……right?! :D
Except the fixed greeting statements, sometimes it's time for us to pay attention to "到"'s usage:
"到" is used after a verb (usually an intransitive verb) meaning "verb's state is finished just now after a period of time, sometimes it means with tough things or not so easy". e.g:
1）我坐到你跟前（Maybe I'm walking in front of you and sit down）.
【Compare: 我坐你跟前：I'm sitting in front of you.】
2）很不容易见到你（Maybe I don't know about you at all, and I've been introduced to you by someone else and then we have a chance to meet each other）