"我會笑到最後"的英文

The sentence is correct.
It is a short form of the idiom below.這是成語的簡寫。
成語是:
: He who laughs last laughs longest.或
: He laughs best (that) laughs last.= If someone does something nasty to you, that person may feel satisfaction, but you may feel even more satisfaction if you get revenge on that person.
I'll laugh last=(你)別高興得過早。/
遲早我會打敗你。/最後勝利的才是我。

hochung9876 : I' ll laugh last.(此句語法正確, 但其意令人費解). 建議改為: I am the one who laughed last . I was the one who laughed last yesterday.

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It should be I will have the last laugh

2013-12-08 19:09:58 補充：
diverseman007: It's not a problem if we say 'I' ll laugh last' as it's an idiom. Moreover, yours is just changing the tense ==