Your taskFill in the gap in each sentence with the correct word or phrase.was walkingwas preparingsawwere drivingwas checkingwere havingwasn't listeningwere you doingfoundwere takingwas shakingwas sittingwentwere tryingwas looking0 / 15 answeredYour score0 / 150%Keep practising! Focus on the explanations below.1I (walk) to the station when it started to rain heavily.Correct answer: was walking▸ Why?Ongoing background action (“was walking”) interrupted by a sudden event (“started”).2While the chef (prepare) the main course, he accidentally cut his finger.Correct answer: was preparing▸ Why?Continuous background activity providing the context for the shorter, completed action.3Sarah was looking out of the window when she (see) a famous actor crossing the street.Correct answer: saw▸ Why?A completed main action (“saw”) that happened in the middle of a continuous state.4We (drive) through the mountains when the car suddenly broke down.Correct answer: were driving▸ Why?An ongoing background action in the past interrupted by a specific completed problem.5While I (check) my emails this morning, the computer screen went black.Correct answer: was checking▸ Why?A continuous action in progress at the moment a sudden event occurred.6The lights went out while we (have) a very important meeting.Correct answer: were having▸ Why?Ongoing background situation (“were having”) during which a sudden change happened.7James (not / listen) when the teacher explained the homework assignment.Correct answer: wasn't listening▸ Why?A continuous state of “not listening” that was happening when a specific event took place.8What (you / do) when you heard the strange noise in the kitchen?Correct answer: were you doing▸ Why?Asking about the specific activity already in progress at the moment of interruption.9I was jogging in the park when I (find) a lost wallet on the path.Correct answer: found▸ Why?A sudden, completed discovery (“found”) that happened during the continuous activity of jogging.10While the tourists (take) photos of the temple, a guide offered to help them.Correct answer: were taking▸ Why?A background action involving multiple people providing the timeframe for a new event.11The detective noticed that the suspect (shake) while he was answering the questions.Correct answer: was shaking▸ Why?A continuous physical state occurring simultaneously with another continuous action.12I (sit) in the departure lounge when they finally announced my flight.Correct answer: was sitting▸ Why?A long, ongoing action (sitting/waiting) interrupted by a specific announcement.13When the alarm clock (go) off, David was dreaming about his upcoming holiday.Correct answer: went▸ Why?A sudden completed event (“went”) that interrupted a continuous state of dreaming.14While the engineers (try) to fix the engine, they discovered a bigger problem.Correct answer: were trying▸ Why?An ongoing attempt or process serving as the background for a new discovery.15I (look) for my keys for twenty minutes before I finally remembered where they were.Correct answer: was looking▸ Why?A continuous action of searching in progress during the period leading up to the remembering.Check AnswersPlease answer at least one question first.Found an error in this exercise? Let us know.