〜たとたん（に）

Question 1

夫は結婚前は優しかったが、結婚したとたんに、態度が変わった。

Answer 1

Before we got married my husband was really kind. But the moment we got married, his attitude changed.

Question 2

国の母に電話をかけた。母の声を聞いたとたん、涙があふれてきた。

Answer 2

I call my mom back home. The moment I heard her voice, I started overflowing with tears.

Question 3

僕が「さよなら」と言ったとたん、彼女は走っていってしまった。

Answer 3

As soon as I said goodbye, she suddenly ran away.

Question 4

勉強が終わったとたん、眠くなった。

Answer 4

As soon as I finished studying, I suddenly got really sleepy.

Question 5

電車が駅に着いたとたん、乗客（じょうきゃく）が大勢乗り込んできた。

Answer 5

As soon as the train arrived at the station, a ton of passengers got on the train.