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sleepy; awake awake; sleep asleep; awake awake; asleep
Whatever However Whichever Whenever
go to bed fall sleep fall asleeping fall asleep
Yes，sometimes No，I did Yes，never Yes，I didn't
had fallen asleep have fallen asleep fell asleep fall asleep
had fallen asleep have fallen asleep fell asleep fall asleep
No, I didn’t Yes, I did Yes, never Yes, sometimes
must have fallen asleep must fall asleep can’t been asleep must be asleep
should have fallen must have fallen could fall must fall
fall ill fall silent fall asleep fall in love
don’t didn’t won’t haven’t
However On the other hand At the same time On the contrary
How long Why How soon How
get to sleep get sleep fall asleep fall to sleep
stay up wake up fall asleep go to bed
Yes, sometimes Yes, I did Yes, never No, I didn’t
should have fallen must have fallen could fall must fall
had fallen asleep have fallen asleep fell asleep fall asleep
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