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They    (not come) back yet. Their parents are still waiting for them.

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that  which  before  when  
is coming back  will come back   comes back  came back  
other  the others  others  another  
will come back  came back  comes back  is coming back  
came back    has come back    hasn’t come back    was coming back  
came back    has come back    hasn’t come back    was coming back  
is coming back    will come back    comes back    came back  
at; first    to; thirtieth    on; the twelfth    on; the nineteen  
other  the others  others  another  
to    to be    to do    to have  
at,first    to, thirtieth    on,the twelfth    on, he nineteen  
already; yet    yet; yet    already; already    yet; already  
is coming back      came back   comes back        will come back  

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