英文GRAMMAR問題..

I do love you.
Do 作用是强調后面的 verb。
可能說了 I love you 但對方不相信，爲了强調愛意，說 I do love you。讀句子時 do 要大聲點。

I wanna to see you 是錯的。 Wanna 就是 Want to，wanna to 就即是 'want to to'，就不對了。

I wanna see you = informal and casual（美式口語）
I want to see you = more formal 正式一點

2009-07-06 07:00:25 補充：
I do love you = formal (but also applicable in conversations)

Lots of poems use similar ways of emphasizing.

i love you 同 i do love you 係一樣.
個 do 係令個句子更真,
好似 "我愛你" .. 同 "我真的愛你"..

i wanna to see you 個wanna 係口語化的want or wanting
唔係US/UK的分別
同i want to see you 一樣..

: )