To find it infuriating when people don’t answer all your questions in email.

[writersblockkk]

I asked someone three questions, it’s about her event which I need her to confirm things on.

And she just responds back answering only one of the three.

Huge pet peeve of mine too OP. My big boss (my boss’s boss’s boss) does this and then complains that we send too many emails!

Or when the reply is nothing to do with what you wrote...

It is annoying. It tends to work better if you:

1. Type out the questions with numbers
2. Are very brief
3. Don't say or discuss anything else in the email

Say let me know the answers to those 3 questions at the end

I get this all the time in work. I solve it by doing the following:

" I would be grateful if you could respond to my three queries below. Please put your response in red beside each question.
Q 1....
Q 2...
Q 3..."

It is then very obvious when they dont answer one of them.

There is an easy solution for this. Use Microsoft Forms. It's brilliant and very easy.