Today, we're going to look at a simple verb where sometimes even native English speakers get it wrong. It's the verb "fill" combined with the adverbs, up, out or in.

This gives you fill up, fill out or fill in.

Fill up generally means making a liquid or a solid go up so that you fill up a container, usually to the top.

Fill out on the other hand generally means to fill out an application or a form.

Here's where it can get tricky. You fill out a form when you fill in the blank spaces!

Further on fill in, it's often used in the sense of replacing something that was there that is missing, such as after you dig a hole you fill it in. Or Mary couldn't babysit that night so she got her friend to fill in for her.

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