let sb be

(also let sb alone)

to stop criticizing or annoying someone

随(某人)去;不打扰(某人)

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Just let her alone – she’s not bothering you.

随她去吧——她没有打扰你。

When he doesn't feel like talking, we just let him be.

他不想说话时，我们就听任自便吧。

Then let him be. You should respect his habit.

那就随他吧。你应该尊重他的习惯。