Thanks for the answers, I think I got it! May I ask one more question in line with this topic?
- Call me when you are at the office tomorrow.
I am asking this question because I know we can't use 'will / be going to' for the future meaning after a conjunction sech as 'when'. For this reason, I must use 'am, is, are' after 'when' instead of 'will be' for a future meaning. In short, I would like to know whether we can use 'am, is, are' after 'when, while, after,...etc' for a future meaning. If you don't like the sentence I have written, please create me a better one for me to understand better.
Thanks again.