“确定”的意思是让一件事情变得明确、肯定。我们用它来表示我们做了决定或找到了正确答案。比如，确定了明天去哪里玩。
“quèdìng” de yìsi shì ràng yī jiàn shìqíng biàn de míngquè, kěndìng. Wǒmen yòng tā lái biǎoshì wǒmen zuò le juédìng huò zhǎodào le zhèngquè dá'àn. Bǐrú, quèdìng le míngtiān qù nǎlǐ wán.
"Confirm" means to make something clear and definite. We use it to express that we have made a decision or found the correct answer. For example, confirm where to go play tomorrow.
在做计划或选择时，我们常使用“确定”。比如，确定生日聚会的时间和地点，或者确定哪个颜色最漂亮。它帮助我们做出清晰的选择。
Zài zuò jìhuà huò xuǎnzé shí, wǒmen cháng shǐyòng “quèdìng”. Bǐrú, quèdìng shēngrì jùhuì de shíjiān hé dìdiǎn, huòzhě quèdìng nǎ gè yánsè zuì piàoliang. Tā bāngzhù wǒmen zuòchū qīngxī de xuǎnzé.
When making plans or choices, we often use "confirm." For example, confirm the time and place of a birthday party, or confirm which color is the prettiest. It helps us make clear choices.
Both mean to confirm, but 确定 can also mean to decide.
确定 means to be sure, 怀疑 means to doubt.