1.Lots of empty wine bottles were found under the old man's
9个回答

第一题but{to}do表目的,doing表状态.

第二题只有祈使句用动词原形,非祈使句动词放开头都用ing.

第三题这句话的意思是“在某种程度上,人类的面部表情不同于动物的,(人类的面部表情}可以有目的地控制.of which 代指"human facial expressions",相当于"whose facial expressions",只能用of which,不能用其他,因为of which 才有whose 的意思.