(一)be动词：am/is/are/was/were,可作谓语动词；
e.g. I am a doctor.
Tom is an eight-year-old boy.
They were classmates before.
(二)实义动词：具有实际意义的动词，如play/eat/see等，可作谓语动词；
e.g. Mary usually eat breakfast every day.
We saw the film together yesterday.
(三)感官动词：和人体五官（口，鼻，皮肤，眼睛和耳朵）有关的动词，可作谓语动词；
1. 后接形容词的感官动词：taste(尝),smell(闻),feel(感觉),look(看),sound(听)+形容词；
e.g. The food tastes delicious.
The T-shirt looks beautiful.
2. 不可接形容词的感官动词：see, watch, listen等。
e.g.Tom often listens to the music.
My mother saw him go to school yesterday.
(四)系动词：通常情况下，可接形容词的感官动词和be动词统称系动词；后接形容词作表语；
e.g.Tom feels good.
Tom and Mary are friendly.
(五)及物动词：可直接接宾语的实义动词，如visit, eat等；可作谓语动词；
e.g.Tom visited the city last year.
My father doesn’t like doing exercise.
(六)不及物动词：不可直接接宾语的实义动词，如listen, live等；可以单独作谓语动词；若要接宾语必须加介词；
e.g.Tom always listens carefully.
He often listens to the music.
Her sister lives in Beijing.
(七)助动词：通常指用来帮助动词变为否定句，疑问句的单词，如do, does, did, have, has ,had等；不可单独作谓语动词；请了助动词的句子谓语动词通常用动词原形；
e.g.Tom doesn’t like the book.
Do you want to be a doctor?
Did your mother stay at home three days ago?
Mary has lived here for three years.
I hadn’t eaten the food before 2000.
(八)情态动词：表示建议，命令，要求等意思的单词（can, could, may, might, shall, should, will,
would, must等）；不可单独作谓语动词；后面必须接谓语动词原形；
e.g.You should have a rest.
Tom must finish his homework today.
Your father can’t be at home now.
