1、Have:have用作助动词时,可与动词的过去分词或“been+现在分词”连用,构成动词的各种完成时态。have的过去分词had还可与主语倒置,构成虚拟条件状语从句。have (got) to作“不得不”解,强调客观上的必要,或由环境、习惯、协约等迫使而不得不做某事。
2、Has:基本意思是“有”,指物质上的所有、身心上的具有或构成上的含有。引申可作“享有”“容许”“招致”等解。
I have a book.
You have a book.
We have books.
They have books.
He has a book.
She has a book.
It has a tail.