Chinese phrase
对不起，我没问就用了你的〜 duì bù qǐ wǒ méi wèn jiù yòng le nǐ de 〜
Meaning
I'm sorry I used your ___ without asking
When to use it
It apologizes for using someone's things without asking. It is a polite way to admit the action and show respect for the other person's permission.
Example dialogue
对不起，我没问就用了你的彩笔。 duì bù qǐ wǒ méi wèn jiù yòng le nǐ de cái bǐ
I'm sorry, I used your colored pencils without asking.
没关系，下次先问我。 méi guān xì xià cì xiān wèn wǒ
It's okay. Ask me first next time.