I have left the column blank for you. Please fill it up/fill it in. I have sent you the blank form for you to fill up/fill in. Kindly send us the blank form for us to fill up/fill in.
Are these sentences correct? And let me know if possible in which context we use what.
Top answer
Use "fill up" with liquids. Please fill up my glass with water. I filled up my gas tank with fuel.
— AlpheccaStars
Use "fill up" with liquids.
Please fill up my glass with water.
I filled up my gas tank with fuel.
Use "fill in" with forms and spreadsheets.
Fill in the blanks.
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