Statement + 吗 (yes/no confirmation)

Checking what you expect

• Add (yes/no ?)吗ma to a full statement to turn it into a yes/no check.
• you你nǐalso也yěto go去qù(yes/no ?)吗ma？ = "are you going too?"
• It's how you confirm something you half-expect.

Statement + (yes/no ?)吗ma ？

• Keep the statement as is; (yes/no ?)吗ma makes it a yes/no question.

you你nǐfull吃饱chī bǎo了le吗ma？

• you你nǐto eat one's fill吃饱chī bǎo(completed / change)了le(yes/no ?)吗ma？ = "are you full?"

Confirming an assumption

• you你nǐalso也yěto go去qù(yes/no ?)吗ma? checks an expectation — you think they might go too.

Recap

Read the full reference: HSK 4 grammar — Particles.