1.Jim has made many friends since he [came] to china
问题描述：
1.Jim has made many friends since he [came] to china
为什么不是：
Jim has made many friends since he [has came] to china
2.She said she was[ ]{get的适当形式}used to these table manners
答
1.我认为现在完成时要用在表示这个动作已经完成或对目前造成什么影响的场合,如句子的第一个地方,而从句中只是表达他来中国是发生在过去的事.所以从句中用过去时.
2.getting,get used to表示从不习惯变得习惯.这是过去进行时,表示正在习惯