TO: preposition or particle?

TO: preposition or particle?
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คำแนะนำของผู้เขียน

When to put -ing form or first form of the verb after "to"? If "to" is a particle (only grammatical function, has no translation), use the first form/infinitive. When "to" is a preposition (it has a meaning and is translated), use -ing form/gerund.