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The teacher    (check) out the number of the books at that time.

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am just helping out  could just help out   just help out  have just helped out  
Check-in  Check-out  Confirmation  Cancellation  
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must; should    can; shall    must; shall    can; could  
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Having checked   Checked   Being checked   To check  
Teachers    Teacher    Teacher’s    Teachers’  
Having checked  Checked       Being checked      To check  
Did; check out    Have; checked out    Are; checking out    Will; check out  
must; should    can; shall    must; shall    can; should  
Teacher’s    Teachers’    Teacher    Teacher of  
take out  check out   pick out  dig out  
Have … checked out    Did … check out    Are … checking out    Will … check out  
nothing    either    neither    none  
Look out    Check out    Go out    Set out  
checking in    to check in    checking out    to check out  
Did; check out         Have; checked out      Are; checking out       Will; check out