不定詞to+動詞，或動名詞v＋ing，皆可作句子主詞或補語或受詞等用途，請問其區分及不同點在那？

To-infinitive（不定詞）：
1) 在以下的動詞之後 —— agree, appear, ask, etc.
    例：I was asked to clean the room.
參考資料：https://www.ef.com/wwen/english-resources/english-grammar/verbs-followed-infinitives/

2) 在疑問詞之後 —— what, where, how, etc.     
     例：I know how to do the question.
3) 在形容詞之後 —— kind, good, naughty, etc.
     例：It is good to go camping today.

4) 在否定式之後 —— not to ___
     例：I was asked not to play online games.
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Gerund（動名詞）：

1) 在以下動詞之後 —— avoid, enjoy, stop, etc.
     例： I enjoy travelling.
參考資料：https://www.ef.com/wwen/english-resources/english-grammar/verbs-followed-gerunds/

2) 在介詞之後 —— to, for, on, etc.
     例：I look forward to seeing you.

3) 在否定式之後 —— not ___ing
     例：I hate you for not being polite.

Reference to your recommended bk by TW Chen's the heart of grammar , which part of speech do you not understand ?!





infinitive adj, n (grammar) in English is non-finite form of a verb used  with or without to,eg:-to know how to do the responds  ; to go to camping today ; to clean the classroom, let Kuangkwo go ; allow him kk to go today; 




gerund is the form of a verb when used as a noun eg:-the -ing form of an English verb when used as a noun(as in "enjoy playing on-line game").as in "hate for being not polite in respond", as in" Let the state of being infinitive".