To take someone's chocolate in Engpsh, you can say "steal someone's chocolate" or "snatch someone's chocolate." The verb "steal" means to take something without the permission of the owner, while the verb "snatch" means to grab or seize something quickly or suddenly.

Here are some example sentences with these phrases:

"Someone stole my chocolate bar while I wasn't looking." (有人在我不注意的时候偷走了我的巧克力。)
"I saw him snatch the chocolate out of her hand and run off." (我看到他从她手里抢走了巧克力然后跑掉了。)

It's worth noting that these phrases are generally used in casual or informal situations, and may not be considered appropriate in more formal or popte contexts.