疯豆：情态动词need
need和dare一样，作为情态动词时，主要用于否定句和疑问句，一般不用于肯定句中（在肯定句中常被must, have to, ought to, should等情态动词取代）。作为情态动词，它的词形只有need一种形式。
You needn't return the book now. You can keep it till next week if you like. 你现在不必还书， 如果愿意，你可以下周还。（needn't = don't have to）
Need I hand in my homework now
我现在就要交家庭作业吗？
--- Need he finish the article next week
他要下个星期完成这篇文章吗？
--- Yes, he must.
是的，他必须完成。
--- No, he needn't.
不，他不需要。（= he doesn't have to）
2．行为动词need
need和dare一样，也可以作行为动词，可用于肯定句、否定句和疑问句中。行为动词need有人称和数的变化。
Plant needs water.
植物需要水。
My shirt needs a button.
我的衬衫需要一枚钮扣。
My car needs repairing.
我的车该修理了。
He has grown up. We don't need to worry about him.
他已经长大了，我们不必为他担心。
You don't need to buy so many things for the picnic.
你不必为这次野餐买这么多东西。
Patience is needed for that job.
干那工作，需要耐心。
提示：
Need作为情态动态时，不要用于肯定句中。
【误】She need do her homework by herself. (need作为情态动词时，不用于肯定句中)
【正】She needs to do her homework by herself.
她该独立完成家庭作业。
need和dare一样，作为情态动词时，主要用于否定句和疑问句，一般不用于肯定句中（在肯定句中常被must, have to, ought to, should等情态动词取代）。作为情态动词，它的词形只有need一种形式。
You needn't return the book now. You can keep it till next week if you like. 你现在不必还书， 如果愿意，你可以下周还。（needn't = don't have to）
Need I hand in my homework now
我现在就要交家庭作业吗？
--- Need he finish the article next week
他要下个星期完成这篇文章吗？
--- Yes, he must.
是的，他必须完成。
--- No, he needn't.
不，他不需要。（= he doesn't have to）
2．行为动词need
need和dare一样，也可以作行为动词，可用于肯定句、否定句和疑问句中。行为动词need有人称和数的变化。
Plant needs water.
植物需要水。
My shirt needs a button.
我的衬衫需要一枚钮扣。
My car needs repairing.
我的车该修理了。
He has grown up. We don't need to worry about him.
他已经长大了，我们不必为他担心。
You don't need to buy so many things for the picnic.
你不必为这次野餐买这么多东西。
Patience is needed for that job.
干那工作，需要耐心。
提示：
Need作为情态动态时，不要用于肯定句中。
【误】She need do her homework by herself. (need作为情态动词时，不用于肯定句中)
【正】She needs to do her homework by herself.
她该独立完成家庭作业。
