对…感兴趣 / 对…有兴趣【duì…gǎn xìngqù / duì…yǒu xìngqù】

对 + topic + 感兴趣 says someone is interested in the topic. The thing you're interested in goes after 对, in front of the verb – where English has it trailing after "in".

感兴趣 is literally "feel interest": 感 is the verb and 兴趣 the noun. Degree words go in front of 感: 很感兴趣, 特别感兴趣.

The topic can't follow the verb

感兴趣 takes no object, so the topic has to go after 对. And 兴趣 is a noun: without 感 or 有 there is no verb.

• × 我感兴趣中文 → 我对中文感兴趣
• × 我很兴趣 → 我很感兴趣

感兴趣 or 有兴趣

对…有兴趣 says the same thing with 有 "have". The negatives follow the verb: 有兴趣 becomes 没有兴趣 or 没兴趣, and 感兴趣 becomes 不感兴趣.

• × 我没感兴趣 → 我不感兴趣
• × 我不有兴趣 → 我没有兴趣

To ask what someone is interested in, the question word goes after 对: 你对什么感兴趣？