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

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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 vegetbables.(改为否定句

1.to do.
2.You need not to eat more vegetables.
(你蔬菜英语打错了)

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 need to do sth的否定形式是什么? 什么是实意动词need 有两种形式1.need to do sth.否定：don't need to do sth.2. need doing 否定形式 need to do sth和need doing sth 的区别 need to do的否定形式 need to do sth 的两种否定形式有什么区别?怎样区分和应用? need to do的否定为什么不可以是 need not to do “need doing sth”“need to do sth”哪里不同? need sth与need to do sth need 的用法need to do sth 和 need doing sth 的区别..有没有need to doin need sth to do