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has happened is happening happened had happened
might happen must have happened would have happened could happen
I saw unusual something happened a terrible accident happened something unusual was seen by me I saw a terrible accident
had happened happened has happened happens
had happened happened has happened happens
had happened happened has happened happens.
unless whether because while
had intended; happened intended; happened intended; had happened would intend; happened
might happen must have happened would have happened could happen
had happened happened has happened happens
should have happened could have happened must have happened would have happened
close; happened closer; is happened closer; happened close; was happened
had would was going to did
unless whether because while
unless whether because while
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