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A.saw had seen has seen was seeing
He thinks he has discovered a new possibility in the link between sun spots and the weather on the Earth. He has great doubts about the theory that the sun' s frequent changes have an influenced on the Earth' s climate. He has been recently informed by other scientists of the possibility that more sun spots will appear. He does not think the causes of the sun spots will be fully revealed by scientists in the near future.
the difference between the employee and the employer has become insignificant people's traditional concepts about work no longer hold true most people have to take part-time jobs people have to change their jobs from time to time
attacked surprised attracted interested
have taken place had taken place took place would take place
attacked surprised attracted interested
have taken place; are going up have taken place; have been gone up are taken place; had been gone up took place will go up
Much as As far as Just as As for
beat sold amazed conformed
Great changes have been taken place What great change How it has changed How great it has changed
beat sold amazed conformed
entertained increased inspired supported
a great many a great mass of a number of a plenty of
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