If the bus doesn't come in 10 minues,I might miss my train.
如果公共汽車10分鐘之內不來的話，我可能就趕不上火車了。
1、解析
in +時間 （在否定句中） 表示在一段時間之內
miss（v.）錯過，未趕上
2、對話
A：Excuse me，does this bus go to the train station?
B：No,not this one. You can take the NO.5 bus.
A：How often does the No.5 bus run?
B：About 20 minutes.
A：If it doesn't come in 10 minutes,I might miss my train.
B：You'd better take a taxi.
3、補充
No. = number(n.) 號
How often… 表示多久（提問頻率）
had better do sth 最好做某事
wait for …等待某人或某物
egg:I'm just waiting for the bus.
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