was/were + ing
1) When Ruth weil (land) in Manhattan , she (wear) her best clothes.
2) The bradleys (celebrate) Thanksgiving when they (get) a call from France.
3) What ( trouver le mot interrogatif) you (do) at 6 yesterday ?? I (prepare) dinner.
4) On 9/11 Mrs Warner (go) to work as usual. She (have) a cup of coffee when she (hear) an explosion ans (feel) the Tower swaying .