@dalehileman,
Thank you very much dalehileman. May I ask you more question?
Would it still be grammatica If I change #1 a little to read:
- As I recall, isn‘t it that you told me you love it when I sing the song? Why do you change your word now?
- Isn't that it was my misunderstanding about your intention?
As for 2 and 3, Am i right to deduce from your reply that they are absolutely wrong in terms of grammar?