need的用法
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need作为动词,有两种理解,一是做情态动词,二是做行为动词。\x0d\x0a1)need作为情态动词时,一般不用于肯定句,只用于否定句/疑问句。\x0d\x0a其后直接加动词原形,没有时态/人称的变化。\x0d\x0a其否定句为在need后面直接加not,或使用缩写needn't.\x0d\x0a如:I needn't work hard.\x0d\x0a其疑问句必须把情态动词need提前,回答也一般借助于need.\x0d\x0a如:Need I help you?\x0d\x0a2)need作为行为动词时,可用于各种句子,有过去式needed和三单形式needs.\x0d\x0a其否定句必须借助于助动词don't/doesn't/didn't等变化。\x0d\x0a如:I don't need to work hard.\x0d\x0a其疑问句也必须借助于助动词do/does/did等变化。\x0d\x0a如:What do you need me to do?\x0d\x0a其结构一般有:\x0d\x0aneed sb/sth 如:I need you. I need your help.\x0d\x0aneed to do sth 如:I need to work harder.\x0d\x0aneed sb to do sth 如:I need you to help me.\x0d\x0aneed doing = need to be done 如:My watch needs repairing. = My watch needs to be repaired
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