try hard

Apparently it was his godmother's plan always to let him try, and try hard, before he gained anything.

Now go still and look sharp and see if we can find him anywhere for a bear will try hard and get away when they first see you.

I try hard, and the Doctor's face flits by and vanishes before I can even tell its outline.

Shall you and I try hard to make it the happiest year of our lives?

Well, will you not try hard to find out where he gets his whisky?