It was all I could do to keep standing.

When she saw the lengths he'd gone to to get all dressed up, she couldn't help letting a brief chuckle escape.

All she could do was watch him walk away.

He did his best never to think of her.

He did his best but soon saw that he could not compete with such a fast runner.

It was all he could do not to laugh.

All he could do was resist laughing.

All he can do is to support himself.

All that he can do is to support himself.

All he can do is support himself.

He had to work as hard as he could to finish it in time.

I gave him the best answer in English to his question that I could.

I had enough to do to look after my own children.

I ran as fast as I could to catch up with her.

We did our best to help him, but he didn't so much as say thank you.

That is the most I can do.

Is that as fast as you can go?

This is the extent of my ability.

That was his nearest approach to a smile.

We need to live our lives to the fullest, as we are not vegetables!