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����1�����ģ���ҫ���㣬�ҳ�����ô����
����(��)i shouldn"t do that if i was you.
����(��)i shouldn"t do that if i were you.(��ʾ��������ʵ�෴����������������was��ֻ����were.)
����2�����ģ�ҫ���ҹ��������������������ҹ���ʲô��
����(��)if my father were here now��he will tell me what to do.
����(��)if my father were here now��he would tell me what to do.(��ʾ��������ʵ�෴�����������у������������ֻ����would��might�ȹ�ȥʱ��)[������у���˸߿�ƶ������������������]
����3�����ģ�ҫ����֪�����ĵ绰���룬�ҿͻ������绰�ˡ�
����(��)if i knew her telephone number��i would have called her.
����(��)if i had known her telephone number��i would have called her.(��ʾ���ȥ��ʵ�෴�����������у������ӿ�ķ���ҫ�ù�ȥ���ʱ��)
����4�����ģ�ҫ������û������ҳ��������
����(��)if it had not rained yesterday��he might come.
����(��)if it had not rained yesterday��he might have come.(��ʾ���ȥ��ʵ�෴�����������у�����ķ���ҫ�������ʵĺ�ȥʱmight��could�� have ��ȥ�ִʡ�)
����5�����ģ��ҳ���ϊ�һ�ʧ�ܣ���ҫ����ʧ���ˣ��һ���ŭ����
����(��)i don"t think that i shall fail. but if i failed��i would try again.
����(��)i don"t think that i shall fail. but if i should fail��i would try again.(��ʾ�뽫����ʵ�෴�����������у������ӿ�ķ�����should��ԭ�ζ��ʡ�)
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