To 之後幾時用 ing form 呢?

當個 to字係做 preposition (前置詞)的時候，它後面就會跟個 noun或者gerund。當 to字後面那個係 gerund時，就是你所說的 ing form 了。

Eg. I go to school by bus. --> 個 to 字係呢度係 prep，而school係 noun。
I look forward to meeting you soon.--> meeting係 gerund，而個to字就係prep喇。

Note: Gerund = ing form of verb 當 noun用。

to 之後0既動詞都應該係現在式, 想改作現在進行式需要助動詞 be
例: After lunch, we are most likely to be going to Ocean Park.

通常係 look forward to 之後會用 ing form
e.g. I am looking forward to hearing from you.