平时随口说的“随便”用英语应该怎么说阿

这个要看场合；
Do as you like.
Go ahead.
It's all the same to me.
随便。

Be/Feel at home.

请随便。

Feel free to go.

随便去不去

He was rather offhand.

他有些随便。

Not serious or sensible enough; casual

漫不经心的；随便的

Help yourself to the smorgasbord.

请随便用自助餐.

Help yourselves to the cake.

随便吃蛋糕吧。

I am just look around.

我只是随便看看。

I'm just having a look.

我只是随便看看。

You can put it anywhere.

你可以随便放。

whatever.或
If you like.

up to you

as you like.

as you like.

It's up to you.