Popular Chinese Words-
我保证！
(Wǒ bǎozhèng!) I promise! (Beginner)
Example:
Wǒ bǎozhèng, xià zhōu yídìng dài nǐ qù hǎibiān wán.
A: 我 保证， 下 周 一定 带 你 去 海边 玩。
I promise I will take you to the beach to have fun next week.
Hǎode, qīn’àide, wǒ xiāngxìn nǐ.
B: 好的， 亲爱的，我 相信 你。
Ok, honey, I trust you.
Further Reading:
◆ Did You Sleep Well? (Beginner)
◆ How Do You Like China? (Beginner)
Learning to speak Chinese is my objective at the present. I know 一定 is used to express certainty, can you give me a word which can be used to express possibility?
It should be “可能 may/perhaps.” Here’s an example: 他可能喜欢数学. He probably likes math.
When “不” is put ahead of “可能”, it means the situation/action that follows is very unlikely happen. For example: 她不可能有三十岁. She probably isn’t 30 years old.