fill in and fill out; possibly and probably

[jiang]

Dear teachers,

I have two questions to ask:

No.1
Now please fill out this application form.
My question is : Can I replace "fill out" with "fill in"?

No.2
Not many people think that way, but ________ you're right.
a. possibly b. probably

Looking forward to hearing from you.
Thank you in advance.

Jiang

[chadley25]

"Fill out" is much more common in American English (for forms, applications, etc.). We use "fill in" for blanks, such as "fill in the blank."

I believe British English uses "fill in" for applications, but I am not 100% sure.

Honestly, for #2, either choice is possible, depending on what's being discussed.`

[bhaisahab]

"Fill out" is much more common in American English (for forms, applications, etc.). We use "fill in" for blanks, such as "fill in the blank."

I believe British English uses "fill in" for applications, but I am not 100% sure.

Honestly, for #2, either choice is possible, depending on what's being discussed.`

Yes, in BrE it's "fill in".