I have always been puzzled and confused of these two phrases: "Fill-up" and "Fill-out". Whenever I go to the Professional Regulations Commission (PRC), I am always instructed to FILL-UP the forms. It even has a big instructions posted on the wall stating to FILL-UP the forms completely. I even hear professionals use the phrase. I always see such also in many of the forms from both private and public entities. But, a teacher of mine told me to use FILL-OUT instead. Why should the preposition be changed?
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You mean fill in, not fill up.

Thanks for the comment anyway, but do you mean I should fill in the form?
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Actually, it's a slightly odd case where you can fill out a form, or fill it in. Both are OK. But you can't say to someone 'Please fill up this form', it's just wrong.

Best wishes, Clive

What do you mean by the following?

Actually, it's a slightly odd case where you can fill out a form, or fill it in.

Are you saying they are odd to say?

I don't understand why "fill up the form" is wrong. I think I hear it every day. What would you say naturally?
Well, native English speakers would never say 'fill up' a form. It may have become a local variant perhaps, if you hear it a lot, or it could be something that people bring in as a direct translation from their native language without considering that the preposition may be different in English.

In mainstream English either 'fill out' or 'fill in'
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New2grammar Actually, it's a slightly odd case where you can fill out a form, or fill it in.Are you saying they are odd to say?
No, Clive said they were both OK.
Clive... it's a slightly odd case where you can fill out a form, or fill it in. Both are OK ...
As for me, I've always used "to fill in a form", because that's what I usually heard. After reading this thread, I checked "to fill out (<=> sth)" and I've learnt another phrasal verb.
Emotion: smile

EDIT: Sorry Nona, I started replying before your post appeared. I'm really a slow typer. Emotion: sad
Thanks Nona! Does it soudn weird to you because fill UP is usually associated with containers? For example, fill up the bucket, fill up your glass, fill up your tank/car. I would like to know how native speakers interpret the preposition 'in' in this phrasal verb. Thanks in advanve


Tanit, thanks

My question to you: .Clive said something about 'odd case' and I can't relate that to the rest of his sentence. To me, odd is negative but later he said, both are OK! I detect contradiction Emotion: sad

I have no problem with Fill in and that's what i hear and use a lot of times. I think I must have misheard out for up. A short sound like this is easily mistaken by me especially the speaker is talking like a bullet train.

Also, fill OUT has a sense of thoroughness that fill IN doesn't have. Am I right?
Clives comment = It is odd that there are two possibilities here (and it's really odd because the two words are opposite to each other: in and out).

Fill up - yes this is usually associated with a container of some sort.

I'm not sure how exactly I interpret the 'in'. I suppose because I am putting information in specified places? But don't then ask me to explain 'out'. No idea on that one.
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