get+宾语+动词不定式或get+动词不定式表示“让某人做某事”；get+宾语+现在分词或get+现在分词表示“开始做某事、某事或者某物处于某种状态”；get+过去分词表示被动；get+宾语+过去分词表示意外事故或自然灾害的发生等等。

get sb to do让某人做某事 
I got Jim to help me with my homework ,because I missed several classes.因为我错过了几堂课,所以让吉姆辅导我做作业 

get sth+adj 使某物变得怎么样 (通常用动词的过去分词充当adj) 
A:Jim,get this job done before 1 o'clock,will you?
吉姆,在一点之前把活做完好吗?

get sb+adj 使某人怎样 
She got me very angry.她让我很生气.

get+adj 变得怎样 
I am getting better.我感觉越来越好.
The leaves are getting green when the spring comes.春天来了,树叶绿了 
get sth 得到某物 
Will you please get the massage for me while I am away.你能在我离开时帮我接收消息吗?