This is the classmate with whom I'll go to Qingdao.这个句子其实是有两个句子构成的.
1.this is the classmate.
2.i will go to qingdao with the classmate.
把两句合并,因为两句中都有classmate所以把classmate作先行词,第一句作主句,第二句作从句
主句是完整写的,因为先行词在从句中作with的宾语,又是人,所以可以用whom,用who,还有用that或者省略that来引导从句,句子中不再出现那个先行词.从句放在先行词后面.
this is the classmate whom/who/(that ) iwill go to qingdao with.因为作介词宾语,所以介词还可以提前到引导词的前面.
I have many friends to whom I am going to send postcards.这个句子中先行词在从句中充当的是间接宾语.
有的时候动词后面只有一个宾语,如clean the floor.有的时候可以有双宾语,如give somebody something 人是间接宾语,物是直接宾语.这个还可以通过一个介词交换位置,如give something to somebody.