【正文】
Sb. + was/were doing( ) + when sb. + 動詞過去式 Someone knocked at the door. The twins watched TV. Someone knocked at the door when the twins were watching TV. while What happened when Tom was riding his bike? He fell off the bike and hurt himself when he was riding his bike. while What happened when Tom was … ? What happened when Tom was … ? What happened when Tom was … ? A:I was watching TV at eight thirty yesterday evening. What were you doing? B:I was playing basketball. A: Oh, you were playing basketball while I was watching TV. I was watching TV at eight thirty yesterday evening. My son was sleeping at eight thirty yesterday evening. I was watching TV while my son was sleeping at eight thirty yesterday evening. I was watching TV at eight thirty yesterday evening. My son was sleeping at eight thirty yesterday evening. I was watching TV while my son was sleeping , my husband was playing puter games at eight thirty yesterday evening. My husband was playing puter games at eight thirty yesterday evening. A:I was doing my homework at … yesterday evening. What were you doing at that time? B: I was watching TV while you were doing your homework. What were you doing at that