Greetings, you most probably want to know the boundary between 'to' as a preposition (as in We went to his house ) and 'to' as an infinitive marker (as in To live is to learn ). If so, the most obvious distinguishing mark between the two is that the preposition to cannot be followed by an infinitive form, so if you see a sentence like I intend to resign , you should know that here is only the infinitive marker. However, if you read this: I'm looking forward to hearing from you , you understand that a preposition 'to' requires a noun or an -ing form after it (as in this case), so there is no infinitive marker.
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angv21It's difficult to get Heather to work
angv21In English it has been argued to belong to 2 different catgories such as preposition and complementizer.- according to another view, the complementizer in these sentences is to, and, personally, I favour this opinion: