Looking on the internet deeply has found these results:

You were a great mentor is the most popular phrase on the web.

You was a great mentor 13,530 results on the web	You were a great mentor 132,200 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
But I was just about to say what a great mentor you've been and ask you... He was my best friend. She was a great mentor of mine, and I think it's only fitting that I draw from her bloodline. I'm sorry I wasn't a great mentor, Caitlin. You've been a great mentor to me. Ian was a great mentor, and I'm thankful for all he's done, but as an artist, I need to express my vision. He was a great mentor to me... and he was And Miss Banks was there as a great mentor for me.	Ian was a great mentor, and I'm thankful for all he's done, but as an artist, I need to express my vision. I'm sorry I wasn't a great mentor, Caitlin. And Miss Banks was there as a great mentor for me. You've been a great mentor to me. You were a great mentor. But I was just about to say what a great mentor you've been and ask you... She was a great mentor of mine, and I think it's only fitting that I draw from her bloodline. You were a great mentor.

You was a great mentor

13,530 results on the web

You were a great mentor

132,200 results on the web

More popular!

But I was just about to say what a great mentor you've been and ask you...
He was my best friend.
She was a great mentor of mine, and I think it's only fitting that I draw from her bloodline.
I'm sorry I wasn't a great mentor, Caitlin.
You've been a great mentor to me.
Ian was a great mentor, and I'm thankful for all he's done, but as an artist, I need to express my vision.
He was a great mentor to me... and he was
And Miss Banks was there as a great mentor for me.

Ian was a great mentor, and I'm thankful for all he's done, but as an artist, I need to express my vision.
I'm sorry I wasn't a great mentor, Caitlin.
And Miss Banks was there as a great mentor for me.
You've been a great mentor to me.
You were a great mentor.
But I was just about to say what a great mentor you've been and ask you...
She was a great mentor of mine, and I think it's only fitting that I draw from her bloodline.
You were a great mentor.