say hello hello要大写吗

say hello中的hello不需要大写

例句如下，请仔细体会和理解

1.

Don't be shy ─ come and say hello.

别害羞——过来问个好。

2.

We were passing through, so we thought we'd come and say hello.

我们路过此地，所以想来问候一声。

3.

Say hello to Liz for me.

替我向利兹问好。