初学者 1 - 情态动词和助动词

to be able to do somehing, make something, etc.

能, 会

used to say what is suitable, right, etc., particularly when one is disapproving of something

应该, 必须

(auxiliary) used with the past participle form of a verb when forming the passive voice

是, 成为

(auxiliary verb) used in forming interrogative and negative sentences

做, 有

used to show that something is very important and needs to happen

必须, 得