-ing form

i)Having 點解係+ing，這裡是完成式，不是have slept嗎?唔明= =
having is present participle phrase, so ing is used.
having slept is past perfect not present perfect tense because having can be had or have/has since it depends on the tense in the sentence, just felt.

in fact , the above struture can be seen as 2 sentence
after I had slept for 12hr , i felt marvellous.
we want the sentense to be simplier so the above struture is used.


ii)having 係not後面，所以是要+ing，是這樣的對吧?例如：I am not going to school./Not doing that I will go home.對嗎?
+ing is not because of not. the original sentence can be rewrite to She's happy about having been invited. so +ing is no relation to not.
ing in the sentence is gerund and i am not going to shcool is present continuous tense.
more examples, he is happy about going school. going is gerund.
the negative form of gerund is he is happy about not going shcool.






要有ii)中的she's =she has 定she is呀?
they are both correct and depend on the tense of sentence.

eg she's money. (has) she's beautiful(is)
she's NOT equal to was



tired