想問：搭錯車or 上錯車的英文係點講架．．?

搭錯車=take a wrong car
上錯車=ascend wrong car

Hope this can help you!

I took(past tense of take) the wrong (bus/taxi/mtr)

搭錯車/ 上錯車
You could say :
get on the wrong car/train/bus
catch the wrong car/train/bus

well, usually people say took the wrong bus for 搭錯車 and got on the wrong bus for 上錯車.

「take a wrong bus」喺意思上正確，但文法應該係「take THE wrong bus」，這說法亦可用於日常英語會話沒問題 (不會被取笑的)。

但要注意Tense：
如果你係事後想解釋俾人聴，應用 simple past tense：「I took THE wrong bus」;
如果你係仲喺車上面想話俾司機聽要落車，應用 present perfect tense：「I have taken THE wrong bus」

I think you are trying to explain why you were late, or failed to keep the
appointment with someone.

You just tell him/her that you boarded the wrong car.
It doesn't matter it is a bus, a tram or a train. It is a public vehicle, that's all.

搭錯車 or 上錯車，英語直譯，就是 to board the wrong car 了。

take the wrong bus.

got on the wrong bus
caught the wrong train

get on the wrong bus