let,s are good friend还是let,s be good friend

问题描述:

let,s are good friend还是let,s be good friend

let's = let us (动宾结构已经完整),整句后面只能是补充修改,完整结构应为to be good friends.(注意复数).不过let之后不定式省略to,最后成为:
let's be good friends.