Why can't bicycles stand up by themselves worksheet answers?

Because they are two tired.

Every bicycle has two tires which sounds like “two tired”, and that is the key to this wordplay.

Word play is an abstract procedure and a type of wit in which words utilized turn into the primary subject of the work, basically with the end goal of planned impact or amusement. Word play is very normal in oral societies as a technique for reinforcing significance.

Have fun :)