Were you busy yesterday? あなたは昨日、忙しかったですか。
Yes,I was. / No,I wasn't. はい、忙しかったです。 / いいえ、忙しくありませんでした。
■be動詞の過去形は、am,isがwasに, areがwereになる。それぞれ主語に合わせて、現在形と同じように使い分ける。
I'm in my room.
I was in my room.
You are happy.
You were happy.
He is ten years old.
He was ten years old.
■Be動詞の過去形を含む分の疑問文、否定文の作り方は、現在形の文の場合と同じである。
He was home yesterday.
Was he home yesterday? −−−− Yes, he was. / No, he wasn't.
He wasn't[was not] home yesterday.