你好,应该是:Can your sister swim?或Is your sister able to swim?~~~~~~~~~~~~~~~~~~~祝你进步, 如对你有帮助,请及时采纳~~~~~~~~~~~~~~~~~~~~~~~~
Can your sister swim?Is your sister able to swim?后者强调能力就是会不会,前者强调一次性的就是这次能不能的意思
不好意思,是 Can your little sister swim?