need to do sth和need do sth区别?到底怎么区分呢?用法我都知道,可还是不太会用.比如 You ____worry about him.是need还是need to呢?

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need to do sth和need do sth区别?到底怎么区分呢?用法我都知道,可还是不太会用.比如 You ____worry about him.是need还是need to呢?
need to do sth和need do sth区别?
到底怎么区分呢?用法我都知道,可还是不太会用.
比如 You ____worry about him.是need还是need to呢?

need to do sth和need do sth区别?到底怎么区分呢?用法我都知道,可还是不太会用.比如 You ____worry about him.是need还是need to呢?
need to do sth时need是实义动词
need do sth时need是情态动词
当实义动词动词用时多用在肯定句中
当情态动词用时多用在否定句和疑问句中
所以此题应填need to

need作情态动词一般用于否定句或疑问句
所以上面应该是need to