grammar - When is "to" a preposition and when the infinitive marker?




  • I want to see you.

  • I look forward to seeing you.



How can one say "to" in the first sentence is an infinitive marker and in the second sentence a preposition when we are given just the following two sentences and are asked to fill in the blanks?




  • I want to ____(see/seeing) you.

  • I look forward to __(see/seeing) you.





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