Hi all. I'm afraid this is one of 'those' posts but I'd really appreciate some advice.

I have to do a demo class for a job and I want to teach modal verbs for deduction in the present and the past, at Upper Intermediate level. Someone better qualified than me suggested this is two grammar points and that I should stick to one, but it seems to be taught this way at this level.

Any pointers would be much appreciated!

Best!