"we need to fill in" vs "we need to fill up"

Question

"we need to fill in" vs "we need to fill up"

Both phrases are correct, but they are used in different contexts. 'We need to fill up' is used when referring to filling a container to its full capacity, while 'We need to fill in' is used when referring to completing a form or providing information. They are not interchangeable.

Last Updated: March 26, 2024

This phrase is used when talking about completing a form, providing information, or adding details to something.

Examples:

Please fill in your name and address on the registration form.
Don't forget to fill in the missing information on the report.

Alternatives:

We need to complete
We need to add
We need to provide
We need to input
We need to write in

This phrase is used when talking about filling something, like a gas tank, to its maximum capacity.

Examples:

We need to fill up the car with gas before we leave.
Please fill up the water pitcher before the guests arrive.

Alternatives:

We need to top up
We need to refill
We need to replenish
We need to load up
We need to stock up

Answer 1

we need to fill in

This phrase is correct when referring to completing a form or providing information.

Answer 2

we need to fill up

This phrase is correct when referring to filling a container to its full capacity.

"we need to fill in" vs "we need to fill up"

we need to fill in

we need to fill up

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