persuade sb.to do sth.； advise sb.to do sth.； try to persuade sb．to do sth．
persuade sb．to do sth．意为“说服某人干某事”，其结果是成功的（即成功地说服某人干某事）。如：
Tom persuaded his father to give up smoking at last．汤姆终于说服他父亲戒烟了。
advise sb．to do sth．意为“劝说某人干某事”，其结果可能是劳而无功（即“说”而未“服”）。如：
She advised her parents to give up smoking, but they wouldn’t listen． 她劝她的父母戒烟，但他们不愿听。
try to persuade sb．to do sth．意为“尽力说服某人干某事”，相当于advise sb．to do sth。如：
I tried to persuade him to continue his study, but I failed． 我尽力劝他继续学习，但没有成功。
