He can swim in the river, which I cannot.
他能在河里游泳，而我不能。
He can swim like a fish.
他能像魚一樣的游泳。
I trust Peter to go to the pool alone because he can swim well.
讓彼得一個人去游泳我放心，因為他會游。
I hear he can swim freestyle, side stroke and breaststroke very well.
我聽說他自由泳、側泳和蛙泳都游得非常好。
He can swim faster than before.
他可以游得比以前快了。