Leonard, I've been WORKING on an opening joke
for our lecture at Berkeley.
The Big Bang Theory Season 8, Episode 19
or a WORKING caboose!
The Big Bang Theory Season 10, Episode 15
l've been WORKING
on something here.
l'm doing a little consulting.
Breaking Bad Season 4, Episode 4
...he was WORKING
at the patent office.
The Big Bang Theory Season 3, Episode 14
I'm WORKING on my lesson plan for Wolowitz.
The Big Bang Theory Season 8, Episode 2