have to do不得不做
have done 曾做过have to do���ò��� have done ��������û��have do��have doing���÷�have����+to do, do ,doing�����ֶ��Ǻܳ���ġ� 1.have to do��ʾ�����ò���ij�¡�����䣺 I have to do some laundry this evening.�ҽ��?�ò�ϴ�·��� 2.have sb. do��ʾ����ij����ij�¡���ע�⣺have to do��ʾ�����Լ����ò���ij�£���have +do�����ʽһ����have sb. do�������ñ������������Լ�������䣺 Mum had me do the housework yeaterday.������������������ 3.have sb. doing��ʾ����ij��һֱ��ij�¡���have +doing��have +do��˼�Ǻͽӽ�ģ��������have +doingǿ����һֱ������䣺 Mum had me doing the housework yeaterday.������������һֱ����������䡰You have noting worry about����ʲô��˼��Ӧ������to�İɡ�you have nothing to worry about������ûʲô�õ��ĵġ�(��û��Ҫ���ĵ����顣)������ѧУ������ʦ�ء����Ǹô��⣬nothing���治�ܼӵľ���to�����ԡ���Ū���ˡ���ȷ���÷����� have nothing to worry about���������Dzο���Ĵ