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1. �� Have to (= ��ͧ) �Ѻ Infinitive �����ʴ���úѧ�Ѻ ����ͧ���������˹��
You have to take off your shoes before you enter the house.
�س��ͧ�ʹ�ͧ��Ңͧ�س�͡��������Һ�ҹ
She doesn't have to work on Saturdays
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2. �� Have to ᷹����� must ��������Ҥ���� ����ʹյ���
You must leave for London at once. (Present)
He had to leave for London at once. (Past)
�س��ͧ�͡�Թ�ҧ����ѹ��
Will he have to leave for London at once ? ( Future)
�Ҩе�ͧ�͡�Թ�ҧ����ѹ��
I shall have to leave for London at once. (Future)
�ѹ�е�ͧ�͡�Թ�ҧ价ѹ��
3. �ٻ����ʸ�ͧ must ��� "needn't" ��������� need 㹻���¤�Ӷ����л���¤����ʸ
Need you be so harsh ?
�س���繵�ͧ�����ǡ��������
They need not dress formally for the occasion.
�ǡ�������繵�ͧ�觵�ǵ������ºẺἹ����Ѻ�͡�ʹ��
You needn't switch on the light. It is still bright.
�س�����繵�ͧ�Դ� �ѹ�ѧ���ҧ����
4. "Need not" �դ���������� "�����繵�ͧ" ���������
"must not" ���¤������ ��������觹��� �Ԩ�óҨҡ������ҧ���仹��
1. You need not drive fast. There is plenty of time.
�س�����繵�ͧ�Ѻö���� �ѧ�������ա����
You must not drive fast. The road is very slippery.
�س����ͧ�Ѻö���� (�����Ѻ����) �������ҡ
2. They need not write more than twenty lines.
�ǡ�������繵�ͧ��¹�ҡ���� 20 ��÷Ѵ
They must not write more than twenty lines.
������¹�ҡ���� 20 ��÷Ѵ
Must
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1. �� must �����ʴ���õ���
I must finish this job before going out.
�ѹ�е�ͧ�ӧҹ��鹹��������稡������͡�
I must practice speaking English every day.
�ѹ�е�ͧ�֡�ٴ�����ѧ��ɷء�ѹ
2. �� must ���ͪ�������觹�鹨е�ͧ�Դ������ҧ��
He must be dead in an hour. �ҵ�ͧ�������
1 �������
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