Unit 9A is about ..., Simple present, Simple past, Past participle, Past perfect, We use past perfect to ..., Talk about 1 thing in the past, A thing in the past that happened before another, Things that will happen, Vacations, For past perfect we use ..., Verb to be, Do / Did, Had + past particple, Had, When I arrived at the airport, the plane __________, had left, left, had leave, had leaving, She was tired because she __________ (not sleep) well, not sleept, had sleep, had not sleept, sleep had, The police arrived after the thief __________ (escape)., had leave, had left, left, had leaving, After she had finished the test, she left the classroom. - What happened first?, She left, She finished the exam, They had eaten dinner before we arrived. - What happened first?, They ate dinner, They arrived, He couldn’t open the door because he had left his keys at work. - What happened first?, He couldn't go in, He left his keys.

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