To annotate you add notes to (a text or diagram) giving explanation or comment. so basically just highlight things that seem important and do the same for small notes, kinda simple.
So.. What are your thoughts...
Prefix I think if that’s what your asking
Answer:
Have you <u>been</u> to Singapore?
Explanation:
Have you be to Singapore, have you being to Singapore, have you went to Singapore are all the wrong tenses.
Have you been to Singapore is in the right time tense.