eng problem~help

Sometimes a word can be different parts of speech in different sentences. For example,
This is a book. (book is a noun)
I have booked two tickets. (book is a verb)

The word "to" can be used as a preposition, an adverb or a particle.
We often see "to" being used as a particle to bring out an infinitive, e.g. I want to go home. This is the reason why you think that it should be "hear" instead of hearing.
In "looking forward to", the "to" is a preposition. A preposition is always followed by a noun, pronoun or gerund, e.g. I have already returned the book to the library.
Therefore, every time you see or use the word "to", you have to know whether it is a preposition, a particle or an adverb.

If you want to improve your English, you should start with the basic grammar rules.

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Phrase即系多個一隻字ge詞組.
looking forward to 系一個 phrase,,但系唔系因為呢個原因而令到後面要+ ger,,兩者拉唔上關系.
looking forward to 點解要+ger?
呢個其實冇乜點解,,要記左佢,,但系你可以咁睇:
呢個phrase後面+ ger,,其實系講緊"成件事",,成件事?
成件事就系"hearing from you",,所以就會 to跟 (一件事).

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looking forward to後面係一定要ing..
但係應該唔係所有phrase都要加..
我所諗到的只有..
couldn't help