ฉันได้รับเชิญจากมหาวิทยาลัยเดิมของฉ

I was invited by my old University (Major gems & jewelry) to post training to students before graduation., And I agree
then they will send the notice to the company.I will ask you I should make it official. Or I need a vacation to help them
.

I was invited by my old University (disciplines & Gems Jewelry), go to patchim to supervise the students before the class ends. and I agree, they will send the invitation to the
to the company. I would ask you if I should do a formal right or I will use the summer vacation to help them
.

I have received an invitation from the University of my original (subjects Gems & Jewelry) to go to ปัจฉิมนิเทศ to students before you finish school. And I said OK, and then
they will send an invitation letter to the company.I'm going to ask you that I should have to do a formal? or I'm going to use vacation days to help them