1. 都可以,不过第二种更佳。2. 单个的分词作定语时,一般放在被修饰词之前。而由分词构成的短语做定语时,则一般后置。但是有时候,也可以把单个的分词做后置定语,只不过比较少用。如:Can you work out these solved problems in another way?Do you know these problems solved by your teacher?3. 再如:You shouldn't drink polluted water.你不应该喝那些被污染过的水。You shouldn't drink water polluted by industrial waste.你不应该喝那