考研系动词都有哪些

在英语中，"考研系动词"通常被称为"助动词"或"连接词"。它们用于连接名词、代词和形容词等成份，构成句子结构。

1、 be 动词：用于表示状态或存在。例如：The cat is sleeping.

2、 have/has 动词：用于表示具有、完成或经历。例如：I have a dog. She has finished her homework.

3、 can/could 动词：用于表示能力或可能性。例如：He can speak two languages. I could swim when I was young.

4、 may/might 动词：用于表示要求、许可或可能性。例如：You may go now. I might have eaten the pizza already.

5、 must/mustn't 动词：用于表示必须或制止。例如：You must wear a mask. You mustn't eat in the classroom.

6、 should/shouldn't 动词：用于表示建议、义务或制止。例如：You should clean your room. You shouldn't smoke here.

7、 will/would 动词：用于表示意愿或计划。例如：We will go to the beach on Saturday. I would like to invite you to dinner.

8、 shall/shall not 动词：用于表示命令、许诺或建议。例如：You shall finish the work today. We shall meet at the library.

9、 could/couldn't 动词：用于表示能力或可能性，与 can/can't 类似，但更正式。例如：He could speak three languages. I couldn't understand what she said.

这些系动词可以根据上下文和语境进行使用，以构建各种语法结构和表达不同的意思。