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did you study have you studied were you studying have you been studying
don’t know; were didn’t know; were haven’t known; are hadn’t known; are
How soon How much How often How long
did you study have you studied were you studying have you been studying
have worked worked will work have been working
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have you come were you have you been will you come
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When Until Ever since Before
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don’t expect didn’t expect haven’t expect wouldn’t expect
How far How long How often How many
You can’t be serious You got it I couldn’t agree more I’m stuck
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come，20 years ago left，Since four years worked，For about four years gone，In 1995
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