I understand that both to + V1; to + V4 are correct
But when do we use them?
For example: to hear from you - to hearing from you.
Is to + V4 just an advanced grammar or when to use it?
I think you are writing about the present participle compared to the to-infinitive. 1. "to" can be a preposition: Let's go to school.
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I think you are writing about the present participle compared to the to-infinitive.
1. "to" can be a preposition: Let's go to school.
In this case "to" is followed by a noun phrase to make a prepositional phrase.
The V+ing can be used as a noun after the preposition "to". Here are many examples:
I look forward to meeting you.
He was used
anonymouswhen do we use them?
It depends on what precedes, and you have to learn which verbs and expressions take the infinitive (to hear) and which ones take the -ing form (hearing).
You can memorize them or you can imitate the usage of native speakers, but however you do it, you'll eventually have make the effort to learn them o