Quá khứ hay khứ tiếp diễn: when I (arive) at his house, he still (sleep) ……………………………………………………………………………… The light ( go) out while we (have) dinner …………………………………………………………………………………… Bill (have) breakfast when I (stop) at his house this morning …………………………………………………………………………………… As we ( cross) the street, we (see) an accident …………………………………………………………………………………… Tom (see) a serious accident while he (stand) at the bus stop …………………………………………………………………………………… While my father (read) a newspaper, I ( learn) my leson and my sister (do) her homework……………………………………………………………………… …………………………………………………………………………………… The children (play) football when their mother (come) back home ………………………………………………………………………………… The bell (ring) while Tom (take) a bath ………………………………………………………………………………… I (be) very tired because I (work) all day yesterday …………………………………………………………………………………… 10 He (sit) in café when I (see) him ………………………………………………………………………………