Most of the others didn't know how to use them and a couple simply couldn't.

Paige stayed with them until she simply couldn't a minute longer.

Because I simply couldn't make up my mind to do it.

And alas, perhaps they simply could not nor ever will.

He thought it rather likely that they simply couldn't.

When it was Messier's turn to speak, he simply could not.

It would not occur to them that a man could simply and suddenly undergo a sea change.

I simply couldn't and can't believe you'd do anything like that on purpose.

She simply couldn't, and at least he was better off than Samantha.

But she simply could not, nor did she know how to do it right.