例如:肯定句:I have a book.
否定句:I don't have a book.
疑问句:Do you have a book?
三单:肯定句:He has a book.
否定句:He doesn't have a book.
疑问句:Does he have a book?
例如:肯定句:I have a book.
否定句:I don't have a book.
疑问句:Do you have a book?
三单:肯定句:He has a book.
否定句:He doesn't have a book.
疑问句:Does he have a book?