以tell sth to sb为例，tell 是行为动词，sth是tell的宾语，而to sb组成的介宾短语则是sth的宾语补足语，是和sth有逻辑关联的，表明了sth的对象.
其它句型也一样.
give sb.sth.= give sth.to sb.
2、pass sb.sth.= pass sth.to sb.
3、show sb.sth.= show sth.to sb.
4、bring sb.sth.= bring sth.to sb.
5、hand sth to sb.=hand sb sth.
6、lend sth to sb.=lend sb sth.
7、send sth to sb.=send sb sth.
8、take sth to sb.=take sb sth.
9、introduce sth to sb.=introduce sb sth.
10、leave sth to sb.=leave sb sth.
buy sth for sb.=buy sb sth.（下同）
bring sth for sb.
find sth for sb.
get sth for sb.
make sth for sb.
cook sth for sb
