kěyǐ yòng jiāotōng kǎ ma?
Can I pay with a transport card?
换乘一号线。
Transfer to the first line
The phrase is: 换乘 (huànchéng) "to transfer" + 一号线 (yī hào xiàn) "line 1." 一 (yī) means "one," 号 (hào) is a measure word for numbers, and 线 (xiàn) means "line."
换乘一号线吧
huànchéng yī hào xiàn ba
Transfer to line 1, please. — More polite, with the particle '吧'.
换到一号线
huàn dào yī hào xiàn
Change to line 1. — More casual and shorter.
请问,怎么换乘一号线?
Qǐngwèn, zěnme huànchéng yī hào xiàn?
Excuse me, how do I transfer to line 1?
在这里换乘一号线。
Zài zhèlǐ huànchéng yī hào xiàn.
Transfer to line 1 here.
Appropriate
Avoid when
You say '换乘一号线' (huànchéng yī hào xiàn).
It's pronounced 'huànchéng yī hào xiàn'.
Use it when giving or receiving directions to transfer to line 1 in a metro station.
Tomyo
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