在英语学习中，情态动词是一个重要的语法点，而其中“can”是最常用的情态动词之一。它不仅可以表示能力、可能性，还可以用来表达请求和许可等。为了帮助大家更好地掌握这一知识点，下面提供了一组关于“can”的专项练习题，并附有详细答案解析。
一、单项选择
1. I _______ play the piano very well.
A. must B. can C. should D. need
答案解析：正确答案是B。“can”在这里表示能力，意思是“能够”。
2. You _______ come in if you like.
A. may B. might C. could D. can
答案解析：正确答案是D。“can”用于表示许可或建议。
3. It _______ rain later today.
A. may B. might C. would D. will
答案解析：正确答案是A。“may”和“might”都可用于表示可能性。
4. She _______ speak three languages fluently.
A. must B. can C. should D. need
答案解析：正确答案是B。“can”在这里表示她具备这种能力。
5. If you don’t hurry up, you _______ miss the bus.
A. must B. can C. should D. need
答案解析：正确答案是B。“can”表示一种可能性。
二、完成句子
1. He _______ swim across the river when he was ten years old.
答案解析：He _______ swim across the river when he was ten years old. 填入“could”，因为这里描述的是过去的能力。
2. The weather report says it _______ be sunny tomorrow.
答案解析：The weather report says it _______ be sunny tomorrow. 填入“may”或“might”，表示可能性。
3. Don’t worry, we _______ help you with your homework.
答案解析：Don’t worry, we _______ help you with your homework. 填入“can”，表示能力和意愿。
4. You _______ borrow my dictionary for as long as you need.
答案解析：You _______ borrow my dictionary for as long as you need. 填入“can”，表示许可。
5. She _______ finish her work on time because she is very efficient.
答案解析：She _______ finish her work on time because she is very efficient. 填入“can”，表示能力。
通过以上练习，相信大家对“can”的用法有了更深的理解。希望大家在日常学习中多加练习，不断提高自己的英语水平。
