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. are talking were talking .talked talks
majority, were most, did most, were majority, was
It was until then It was not until then Not until then Not until when
majority；were most；did most；were majority；was
All students had traveled in commercial planes before. All students were nervous. Most students felt nervous traveling in commercial planes. Most students felt nervous when they were taken up in a fighter plane.
majority; were most; were most; did majority; did
talked were talking talking talk
when were the sports meeting going to be held when the sports meeting were going to be held if was the sports meeting going held if the sports meeting was going to be held
the students would be permitted had the students been permitted would the students be permitted the students had been permitted
do will do did were doing
when; shouting while; to shout when; to shout while; shouted
when; shouting while; to shout when’ to shout while; shouted
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