关于语法问题 有点难 thanks

1 需要加。 这不是动词不定式 的省略问题2 我认为 是前者 介词短语 修饰 靠近的名词 如果 是后者 第二个 名词前 的定冠词 应去掉 谓语动词 可以 用单数 3 but前面的逗号去掉不去掉 都可以not only。。。but (also)。。。是并列连词,意思是"不但。而且。"。如果 非要说 哪一个是连词 那就是 but4 single这里是,名词"个人"的意思 加's 是名词所有格5 根据句子意思 on their own ground是介词短语,修饰the project。做定语。 再问： 1。You should have received 4 letters by now �� I should have received 4 letters from them��but i got none���������ô�ֱ棿 2。֮ǰһ��way���that���⣬��Ϊin which=that�������Is this the museum �� ��you visited yesterday������������ 再答： You should have received 4 letters by now �� I should have received 4 letters from them��but i got none������Ϊ ����˼ ��ȷ������� û��Ҫ�ֱ� ���� �� �Ʋ� ���� ���⡣��Ϊ�Ʋ������ ��������� ���� ���ʼ���  ����Ϊ ������ ���Ƕ� ��ȥ������Ʋ� ֻ���� ���Ʋ������෴  ������ ˵���� ���ȥ�෴����������  ��Ҳ�ܾ�̧�ܡ�2。֮ǰһ��way���that���⣬��Ϊthat=in which�������Is this the museum �� ��you visited yesterday��ֻ�����ϵ��� that ��������visited�ı��� that ��ʱ ���Դ��� in which �� ��ϵ���� ���� �� in which�͹�ϵ���� ���� ���� that �� ��ϵ��� �������� who ���Դ��� whom �� whom ���ܴ���who     һ��再问： 3。Not only did he speak English correctly, but also I speaks it fluently���������ǰ����he��������I������Ҳ������but�����ʣ���not only�أ� 4。single������adj���˴�Ϊʲô�����������ʼ�s�أ� 再答： 3。Not only did he speak English correctly, but also I speaks it fluently���������ǰ����he��������I������Ҳ���� ���Կ��� ���о� but�����ʣ�not only�Ǹ��� ���� ����ľ��� ����alsoҲ�Ǹ��� ��ȥ�� ���Ӳ���װ Ҳ���� 4。single������adj���˴�Ϊʲô�����������ʼ�s�� every single��s former secretary ��every single former secretary����˼ �Dz�һ��� ǰ�� Ҳ��ָ���� ÿ������ ָ���� ǰ ���� ����Ӧ�ð� singleҲȥ�� ��Ϊ��every�����ظ� ÿλǰ����再问： ���ʸ����⣺1。Lily likes dancing and hates singing��������Ӳ���Lily likes dancing and she hates singing ʡ����she����ǰ���Ǽ