怎样区分need在句子中是做实义动词还是情态动词?

答案:to clear...up
1.need 作实义动词(也叫行为动词)时,可用于肯定,否定,疑问各种句型,与其它的实义动词在语法用法上一样,后面跟另一个动词时,要说 need to do.例句:I need to clean my shoes.Does he need to lock the door?You don't need to water the flowers.
2.need 作情态动词,只用于否定句和疑问句或条件句,其实说白了就是情态动词 need 不能用于肯定句.例句:Need he lock the door?Yes,he must./ No,he needn't.You needn't water the flowers.
因为你这句话是肯定句,所以 need 不能是情态动词,只能是实义动词,因此,空格上填不定式 to clear...up.