意识游记英语世界篇〈大纲5-6〉(4)

【must】1.表示必须eg：You must eat a carrot first!2.表示禁止eg：You must not smoke here.（must not,只表示必须不的意思）3.表示推测一定，肯定〈只用在肯定句中〉eg：You must like pandas.
【will/would】1.构成将来时eg：I will eat an apple.〈现在将来时〉I would eat an apple.〈过去将来时〉2.表示请求，建议eg：Will you lend me that book？Would you please lend me that book？〈第二句更委婉〉3.表示推测，假设eg：Ask me,I will/would know.〈would语气更弱〉记得具体问题，具体分析，因为很可能would它还表示过去将来时态。
【shall/should】这组情况有点特殊，咱们分开来看
【shall】1.构成将来时态〈跟will差不多〉eg：I shall be there at 9AM.2.表示请求或征求意见eg：Shall we meet at 9AM？3.警告，命令eg：You shall not pass!

【should】1.表示应当eg：You should eat more carrots.2.表示有一定根据的推测eg：It should rain tomorrow.（可能性程度比较大）3.表示竟然意思eg：It is surprising that you should be late.4.构成虚拟语气eg：If It should rain tomorrow,I would not go.
【ought to】表示应该意思，跟should用法大致相同但是语气更强一些。We ought to eat the carrots.
【need】1.需要，有必要eg：He need wait.（need做情态助动词时不用考虑变位）否定情况：He need not wait.
如果need做谓语动词呢？需要考虑主谓一致就是这样的eg：He needs to wait.否定情况：需要借助一个助动词do，He does not need to wait.
【dare】表示敢eg：How dare you!
【used to】表示过去的动作并强调和现在的对比eg：I used to eat apples.Now I only eat carrots.〈be used to doing表示习惯做某事〉