My question hails from this answer.
Let's take one of the examples mentioned there.
Seven steps to reaching your goals
Non-native speakers like me can identify if the sentence is already written. Say the one I just quoted. I see that 'to' is followed by 'verb-ing' and therefore, it's a preposition and not an infinitive marker.
But, I'm pretty sure that if I were to write this sentence, I'd have gone for...
Seven steps to reach your goals
Now, the question is, how to identify whether we use 'to' as an infinite marker OR a preposition? I repeat, I'm asking about writing on my own, and not something that is already written.
The similar question has been asked previously and the answer says that 'there's no such rule'. But then, Damkerng has come up with a very useful comment. I'm looking forward to having such kind of answer to this. If there's no one rule, at least something that helps us decide it?