Unit 3
定义
连系动词用于连接主语和表语,说明主语的状态,性质,特征或身份的动词。常见的系动词是be(am/is/are);除be外,还有appear, seem,look , sound , feel, taste, smell,become, come, get, grow, turn, fall, go,keep, remain, stay, stand , prove 等。