1. Modal Verbs
1.1. Possiblity
1.1.1. General: Can
1.1.1.1. Price can go high in London. Beijing can be cold in the winter.
1.1.1.2. Specific: Could
1.1.1.2.1. He could be on the bus.
1.1.2. Future: Could/might/may
1.1.2.1. If we don’t hurry we could be late.
1.1.2.1.1. 主将从现:在有时间状语从句、条件状语从句和让步状语从句的复合句中,主句如果用将来
1.1.3. Past : could have done/ might have done/may have done
1.1.3.1. It’s ten o’clock. They might have arrived now. They could have arrived hours ago.
1.2. Ability
1.2.1. General(swim/language): Can
1.2.2. Past : Could/couldn't (General) was able to/couldn't(Specific)
1.2.2.1. 1.I could read when I was four. 2.When the computer crashed yesterday, I was able to fix it. 3.He called us because he couldn't find the house.
1.2.3. Future: Can/can't(specific) Will and won't be able to(general)
1.2.3.1. At the end of the course, you will be able to make your own website. I can't come to the party
1.2.4. Present: Can
2. RULE: 1 and ONLY ONE predicate verb in a sentence
3. Types
3.1. Notional Verbs 实意动词
3.1.1. action (bring, read, walk, run, learn), an occurrence (happen, become), or a state of being (be, exist, stand)
3.2. functional 非实义
3.2.1. Auxiliary verb 助动词
3.2.1.1. List :be (am, are, is, was, were, being, been), can, could, dare, do (does, did), have (has, had, having), may, might, must, need, ought, shall, should, will,would
3.2.1.2. Functions
3.2.1.2.1. tense 时态
3.2.1.2.2. modality 情态(modal verbs 情态动词)
3.2.1.2.3. mood 语气
3.2.1.3. 半助动词: had better (do sth)【暗含如果不这么做会有不好的后果
3.2.1.3.1. you had better tell her the truth