作业帮need的否定形式可以是need need to do sth为啥在否定形式时不可以呢?need doing sth在否定形式时怎样才能判断need to do sth与need doing sth?例题：1.He does not need________(do) too much homework.2.You need to eat more veg
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need的否定形式可以是need need to do sth为啥在否定形式时不可以呢?need doing sth在否定形式时怎样才能判断need to do sth与need doing sth?例题：1.He does not need________(do) too much homework.2.You need to eat more veg
need的否定形式可以是need need to do sth为啥在否定形式时不可以呢?need doing sth在否定形式时
怎样才能判断need to do sth与need doing sth?
例题：1.He does not need________(do) too much homework.
2.You need to eat more vegetbables.(改为否定句
need的否定形式可以是need need to do sth为啥在否定形式时不可以呢?need doing sth在否定形式时怎样才能判断need to do sth与need doing sth?例题：1.He does not need________(do) too much homework.2.You need to eat more veg
1.to do.
2.You need not to eat more vegetables.
(你蔬菜英语打错了)
当need是行为动词是否定形式是 don't/doesn't need
当need 是情态动词时否定形式是needn't
例1. to do
例2. You don't need to eat more vegetables.
主语是人时用need to do
主语是物时用need doing ( = need to be done)
need有两种词性 动词和情态动词
当句子是陈述句（主谓宾 主系表）时或 肯定句时 是动词
前面如果要够成否定必须有助动词 此时 need要接to do
反之 句子是否定或疑问句时 need做情态动词用接do
1.to do 2.You needn't eat more vegetables或You need to eat less vegeta...
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need有两种词性 动词和情态动词
当句子是陈述句（主谓宾 主系表）时或 肯定句时 是动词
前面如果要够成否定必须有助动词 此时 need要接to do
反之 句子是否定或疑问句时 need做情态动词用接do
1.to do 2.You needn't eat more vegetables或You need to eat less vegetables
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