that stuff shrek was talkin about go research it!
I/You/We/They have grinned. He/She/It has grinned.
The present perfect tense of "grin" is "have grinned."
I grinned at the person telling the joke.
The boy grinned at his mother because he had an idea.
The People Who Grinned Themselves to Death was created in 1987-09.
Grinned
of Grin
yes
the child gave a grin after having a super chocolate Sunday
Since you saw him grin when you did I am sure he knows he grinned at you.
everyone
yes