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They finish     (clean) the classroom.

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mustn’t ; must    needn’t ; must    can’t ; must    needn’t ; may  
clean; clean   clean; to clean   to clean; clean   to clean; to clean  
for; finish      of; finish    for; to finish      of; to finish  
clean    to clean    cleaning    cleaned  
must finish    would finish    had to finish    finish  
for; finish      of; finish    for; to finish      of; to finish  
finish  will finish  would finish  can finish  
to finish reading  to finish to read   finish reading  finish to reading  
to finish reading  to finish to read   finish reading  finish to reading  
do; finish    did; finish    does; finish    will; finish  
when do they finish the work    when will they finish the work    when they will finish the work    when they finish the work  
clean    cleaned    cleaning    cleans  
Start-to-start, start-to-finish, finish-to-finish, finish-to-star  Early start, early finish, late start, late finis  Predecessor-to-successor, predecessor-to-predecessor, successor-to-successo  Primary-to-secondary, primary-to-finish, secondary-to-secondary, finish-to-finis  
have finished; did; finish    finished; have; finished    finish; do; finish    have finished; have; finished  

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