第1个回答 2017-04-10
is 是 be 的一种形式.常作联系动词,后面接形容词、名词、介词等作表语.如:
He is a teacher.
She is beautiful.
Tom is behind the tree.
do 可以作为助动词,和主要动词一起连用,构成否定、疑问等.如:
I like music. -- I don't like music. Do you like music?
do 还可以作为实义动词,“做”的意思,用法跟其他实义动词一样.
第2个回答 2017-02-04
系动词be用is(am,are,was,were); “有”动词用have(has,had); 其他实意动词用do(does, did)。
He is a doctor. They have lots of money. We do morning exercises every day.
Is he a nurse? Have they any money? Do they work eight hours a day?
He is not a worker. They have not any money. They do not know it.
第3个回答 2017-02-04
问句的话
一般现在时的时候用do,一般完成时的时候用have,现在进行时的时候用is