has the pleasure of inviting you to the opening of the exhibition OR
has the pleasure to invite you to the opening of the exhibition.
I will be greatful for your help.
has the pleasure of inviting you to the opening of the exhibition OR
has the pleasure to invite you to the opening of the exhibition.
Kofeyna.
These are correct:
... has the pleasure of inviting you to the opening of the exhibition.
... is pleased to invite you to the opening of the exhibition.
not a teacher