在英语中，“want sb to do”是正确的表达方式，用于表示“想要某人做某事”。例如：
1. I want you to help me with my homework.
2. They want us to attend the meeting tomorrow.
3. She doesn't want her children to play outside after dark.
而“do”本身并不能直接跟在“want”后面表示“想要某人做某事”，通常需要加上“to”来构成正确的动词不定式结构。例如：
1. I want to go to the park.
2. They want to buy a new house.
总结：
使用“want sb to do”来表示“想要某人做某事”。
“do”本身不能直接跟在“want”后面，需要加上“to”来构成正确的结构。
