请问has不是当主语为第三人称单数时用的吗?为什么有时用have啊例句：doesTomhaveshortlegs?和dotheyhaveapples?

Question

请问has不是当主语为第三人称单数时用的吗?为什么有时用have啊
例句：does Tom have short legs?和do they have apples?

Answer 1

1.因为前面有助动词does,所以后面跟原形have.比如 tom has short legs.（用has）\x09tom doesn't have short legs.（有助动词doesn't,用have）\x09does Tom have short legs?（有助动词does的问句,用have）
2.因为有助动词do并且they是复数,所以后面跟 原形.比如 they have apples.（因为they是复数,用have）\x09do they have apples.（因为they是复数,并且因为助动词do的问句,肯定用have）