Present Perfect - output my day

Review what I learn about present perfect today.

A period time that continue from the past till now. The action is past, and result is now.

I haven't eaten anything since yesterday.
We haven't seen each other for a long time.
Have you met him recently?
We have mentioned a lot of problems in a few days.
It's the first time it's happened.
A : Have you eaten a natto before?
B : No, this is the first time I've eaten a natto.

Thanks