My hobby is swimming.这句话的意思是"我的爱好是游泳。

"此句的同义句有:1.I'minterested in swimming.我对游泳感兴趣。

2. I like swimming best.我最喜欢游泳。

3. My favourite sport is swimming.我最喜欢的运动是游泳。

4. I' m interested to swim.我对游泳感兴趣。