Grammar Nanny gave the following rules that will help us learn how to use fill up, fill in and fill out.
(a) Fill up- It means to make full or fill a container (or anything) with something up.
Ex: The gasoline boy filled up the tank with gasoline.
-Fill can also be used as a substitute for fill up.
Ex. You fill up the container with water- You fill the container with water.
(b) Fill in- It is used to mean these:
Supply something that’s missing.
Enter something (one field or a few fields only; not the whole form) on a form.
Substitute for an absent colleague at work.
Ex. With a lip pencil, outline lips and fill them in.
(c) Fill out- It means to complete a form or a survey by supplying the needed information.
Ex. Please fill out the document and send to me after you are done with all the information being asked.
To read more about this topic, please click here: Fill up, Fill in and Fill out
To take the quiz, please click here.
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