Good afternoon, teachers.
If you have any questions, please tell me.
In this sentence, is the word any used here right? Why not use some?
And is the word questions right? Or should I use its single form question?
The original question is best. Stick to that one.
'Any' is therefore more likely, unless the speakers sees that the person addressed appears to be waiting for the chance to ask questions.
I thought I was becoming absent-minded, responding to questions and forgetting to submit them. I now see that you are running two threads on the same topic. Please don't do that it can lead to confusing and contradictory answers.
For purposes of choosing between 'some' and 'any', note that conditional sentences (denoting hypothetical situations) are treated essentially as interrogatives. Thus
If you have any problems, I'll help you.
is correct, while
*I had any problems, but you didn't help me.