あっ、バスが行ってしまう。

あっ、ばすが行ってしまう。

There goes our bus.

あっ、バスが行(おこな)ってしまう。

A, basu ga okonatteshimau.

あっ (あっ、あ、アッ)

Ah! (expression of surprise, recollection, etc.); Oh!; Hey! (to get someone's attention)

バス (バス)

bus; bath; bass

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

行う (おこなう)

to perform; to do; to conduct oneself; to carry out

Readings: コウ、ギョウ、アン、い.く、ゆ.く、 -ゆ.き、 -ゆき、 -い.き、 -いき、おこな.う、おこ.なう

Meanings: going, journey, carry out, conduct, act, line, row, bank