English lesson

Every weekends, I take English lesson.
Yesterday, I took a lesson as usual and I understood grammar.
I hadn't been understanding how to use the past perfect and the present perfect since I was junior high school studnent.
Also, I don't know what diffrence between them is. But teacher said to me simply.
"keeping or not keeping"
It's really a short sentence but I satisfied about it!! That explains a lot.
I thought when I have question about English, I don't read English text anymore.
Asking teacher is shortcut!!
Recently, I don't have a lot topics and she will travel Thailand so we can't meet for 2 weeks.
I have to save story. Sometimes, I am annoied with me when I can't expalain well.
I need to increase vocabulary. I hope she enjoys herself in Thailand.