Learn what "but you need to be careful" means, when people say it, and how to use it naturally in English.

It means the speaker is telling someone to act cautiously because there may be danger or risk.
From Undercovered Heart, Episode 15
The speaker warns someone to be careful.
Use this in everyday speech when you want to caution someone. It is common and natural, though it can sound serious depending on the context.
Scenes unlock real expressions as you watch
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