Statement + 吗?
The particle 吗 is added to the end of a declarative sentence to turn it into a yes/no question. No word order change is needed — just append 吗. For example, 你是学生 ("You are a student") becomes 你是学生吗? ("Are you a student?").
你喜欢吃辣的吗?
nǐ xǐhuān chī là de ma?
Do you like spicy food?
明天你有空吗?
míngtiān nǐ yǒu kòng ma?
Are you free tomorrow?
这个是你的吗?
zhège shì nǐ de ma?
Is this yours?