Nobody can pedal the bike for you.
If you want to see a shooting star, you might have to spend a lot of nights looking up.
It's not enough to be able to spell "magnificence" in your bedroom. You have to be able to spell it at the microphone during the spelling bee.
One thing you can't pretend to be is funny.
It's easier to knock on a door that's not shut all the way.
Even babies like to grab for things just beyond their reach.