Why is "ing" put after "to" here?
This sentence is in present progressive tense and so the verb is put in -ing form to indicate that the action is going to continue on. The progressive tense is not generally used after the preposition "to" in a sentence except after the phrase "close to". Ex: I was so close to falling asleep when the dog started barking. Ex: You are so close to winning the race - keep going!
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