(48)「時を表す」のに役立つ定番表現

When A, B. (Aの時B)
When he turned up, the party was over. (彼が表れた時、パーテイは終わった)
Please tell her to call me back when she comes in. (彼女が来たら私に折り返し電話するように伝えてください)

as … (・・・する時に⇒同時性を表します)
As I entered the room, they applauded. (私が部屋へ入って行ったとき、彼らは拍手した)
I saw him as he was coming out of the house. (彼が家から出てくるのが見えた)

as soon as … (・・・するやいなや)
Orders are processed as soon as they reach our warehouse, and are usually shipped within 48 hours. (注文は当社の倉庫に到着次第処理され、通例48時間以内に発送されます)

while … (・・・している間に)
He came while I was out. (私の外出中に彼がやって来た)
While she was in Japan she bought the camera. (彼女は日本にいた時にそのカメラを買った)

before … (・・・する前に)
I’ll finish it before you come home. (あなたが帰る前にそれをすませておきます)

after … (・・・した後で)
I will go out after I finish my homework. (宿題を終えたら出かけます)

… ago (今から・・・前に)
20 minutes ago (20分前に)

in … time (今から・・・後に)
in 20 minutes time (今から20分後に)