❶were doing で~していた; ~しようとしていた ⦣ 過去進行形.
We were studying in the library when the earthquake occurred.
We were studying in the library when the earthquake occurred.
地震じしんが起きた時私たちは図書室で勉強していた.
Were Mary and Jane playing tennis?—No, they weren't.
会話Were Mary and Jane playing tennis?—No, they weren't.
メアリーとジェーンはテニスをしていましたか.—いいえ, していませんでした.
Where were Mr. and Mrs. Smith going?
Where were Mr. and Mrs. Smith going?
スミス夫妻はどこへ行くところでしたか.