1.People wishing to visit that place will come here tomorrow.wishing to visit...".修饰名词的成分叫定语.这句"wishing to visit..."在people后修饰people,所以为后置定语.

　　2.主语补足语必须有两个条件:(1)句中的谓语动词必须是及物的,后跟宾语+补语;(2)主语补足语必须出现在被动语态的句子里,主补其实是被动语态的宾补.如:I kept the baby sleeping.这里sleeping是宾语the baby的补语.但变被动语态后,The baby was kept sleeping by me.这里sleeping补充说明主语the baby,成了主补.