If you wave your arms around you can find a gas. Not that we suggest it, but you know you've got some spit. That's a liquid. That's a liquid too. The main thing is to figure out what makes those things liquids.
Liquids are a between phase of matter.
They are right between solids and gases. One characteristic of a liquid is that it fills the shape of any container which holds it. So you pour some water in a cup. It fills up the bottom of the cup first and then fills the rest. When it is in that cup, it also has a flat surface.