If you are worn out, you are completely tired since you have been working hard.
Choose your pals wisely and carefully. There’s never an old boot, but there’s the shape of a foot in it. Your character will be shaped by the influence of your bosom pals.
That ill-mannered boy is as common as an old shoe. He seems entirely low class and uncouth.
That educational system cannot be changed and improved. Like old boots, past all hope of mending.
My room is cozy and snug. I do like my room very much. Indeed, it is as comfortable as an old shoe.