Do

I can't do it
I've tried my best
I can't do it
I've tried my best
I've tried my best

I can't do it
I've tried my best
I can't do it
I've tried my best
I've tried my best

I've tried my best
I've tried my best
I've tried my best
I've tried my best

You'll have to do

You'll have to do it
You'll have to do it (I've tried my best)
You'll have to do
You'll have to do it
You'll have to do it (I've tried my best)
(Do it)
You'll have to do it
You'll have to do
You'll have to do it (I've tried my best)
You'll have to do it
You'll have to do it (I've tried my best)
You'll have to do
You'll have to do it
(Do it)
(I've tried my best)
You'll have to do
I've tried my best