I was just working on a Chinese review app and came across the sentence:
And I was wondering if the doubling of the first character is unique to certain kinds of verbs or all 2 character verbs.
Or can I also say 他游泳得很快。?
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I agree with comment 1 & 2.
游泳 is Separable Word(离合词). There are some other 离合词: 吃饭， 睡觉， 散步， etc.
The grammar here is that 离合词 can not be followed with an object or a complement directly.
You should also note that not all two-character verbs are separable(离合词), hence follows the rules above.