宾从
1.I don’t know if there will be a bus any more
2.Could you please tell meif there are any restrooms?
3.Nobody knew if he could pass the exam.
条状：
1. If it rains, i won't go out tomorrow.
2.If you open the door,i will come in.
3.If I were you, I would go with him.��䣨5������״��Ӿ䣬������Ӿ䣬����if ����ù�ȥʽ������һ����10����۵ġ�����ģ�Ͷ�һ�����Լ���ʰ���~