动词的种类1.2 .助动词3 .情
1.连系动词 要与表语一起构成谓语常用的系动词：be, become, seem       get, grow, look, smell, feel,        sound, turn1.He got very angry when he heard it.2 Leaves turn yellow in
2 助动词： 和别的动词一起构成谓语（构成时态，语态，疑问句或否定句）     (be, do, have, shall/will) 1) Have you read this book before? 2)He is writing a lesson . 3) Did he go there yeste