has的汉语意思是什么意思

　　例句：

　　Her service has improved.

　　她的发球有了提高。

　　Just as John has changed, so has his wife.

　　正如约翰已经变了，他妻子也变了。

　　Bob Morgan has offered his resignation and it has been accepted.

　　鲍勃摩根已递交了辞呈，并且已被批准了。