英语中第三人称的意义都有哪些?列举出来,怎样运用到句子中去?如在have与has,do中?

第三人称单数,如he,she ,it,your father,Andy等
应该用has ,does
He has a rubber.
She does her homework.
第三人称复数,如they,his friends,my brothers等应用have,do
They have too many books.
My brothers do well in Maths.