您好,to 这个英语单词可以引导(动词不定式),也可以作为(介词)使用,其差别在于:
pay attention to something
pay attention to the teacher(the teacher 为名词)
pay attention to the traffic(the traffic 为名词)
pay attention to the crossing pedestrians(crossing 为形容词,名词时 pedestrians)
look forward to something
look forward to your coming(coming 为动名词)
look forward to seeing you again(seeing you again 为动名词词组)
这里的 to 都是介词性质。
2)做动词不定式的引导词时,后接动词原形,比如:
want to do something(to 为动词不定式,后接动词 do 的原形)
like to read books(to 为动词不定式,后接动词 read 的原形)
下面的这个句子:I am going to go to school tomorrow morning at 7 am.
第一个 to 后接动词原形 go,所以 to 是动词不定式。
第二个 to 后接名词 school,所以 to 是介词。