kěyǐ yòng jiāotōng kǎ ma?
Can I pay with a transport card?
要坐几号线?
Which line should I take?
要 (yào) means 'need to', 坐 (zuò) means 'take/ride', 几 (jǐ) means 'which' (for numbers), 号 (hào) means 'number', and 线 (xiàn) means 'line'. Together it's literally 'Need to take which number line?'
请问要坐几号线?
qǐng wèn yào zuò jǐ hào xiàn?
Excuse me, which line should I take? — More polite because it starts with '请问' (excuse me).
坐几号线?
zuò jǐ hào xiàn?
Which line to take? — Shorter and more casual, omitting '要'.
请问要坐几号线?
qǐng wèn yào zuò jǐ hào xiàn?
Excuse me, which line should I take?
你要坐五号线。
nǐ yào zuò wǔ hào xiàn.
You need to take line 5.
Appropriate
Avoid when
You say '要坐几号线?' (yào zuò jǐ hào xiàn?).
It is pronounced 'yào zuò jǐ hào xiàn?' with the tones: yào (4th tone), zuò (4th tone), jǐ (3rd tone), hào (4th tone), xiàn (4th tone).
Use it when you are in a metro station and need to ask which line to take to reach your destination.
Tomyo
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