pay attention to(此处to为介词) doing sth为固定短语.介词后面当然跟名词,protecting为动名词,相当于名词.记住此处的to为介词是关键.to还有一种定式是不定式,就是 to do sth这个格式.
第二个问题：前面已经说明是in the past ,为一般过去式,always只是表示常常的意思,时态上不必要考虑
we must pay attention to protecting our environment.这里的"prot
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