@mihocomo,
Hi dalehileman and JTT san
I appreciate that your reply and giving me more explanations and clues for my question!
I've been thinking there must be a clearly answer the way to use " it " or " that " for " I appreciate ..." .
Because I thought all the English should work with grammar systematically.
But since I was thinking of the post from JTT san, I remembered Japanese language has similar thing.
Language works on grammar basically but there is something that doesn't follow. It is just how they say or It is depend on the context or etc ...
I thought my topic is happening very similar thing.
It could be working on the grammar but it could be working depend on the context.
Thank you very much for your posts.
I appreciate that! (hopefully " that" sounds natural on this sentence)