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They have started to produce electric cars. They have done extensive research on electric cars. They have given up producing electric cars. They have produced thousands of electric cars.
Companies have not been given an equal chance to develop their business. A company will go bankrupt if its cars have to be installed with pollution control devices. The US government has not set up standards on pollution control for car producers. It is necessary to persuade producers to take effective pollution control measure.
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had been studying have been studying have studied are studying
One of the major tasks of education is to discover the most promising students. In order to teach effectively, educators are requested to lay emphasis on one particular field. Some subjects have been over-emphasized in public schools. The progress of the society cannot merely rely on inventors.
has been completed would complete would have been completed will be completed
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will have should have must have have had
They have started to produce electric cars. They have done extensive research on electric Cars They have given up producing electric cars. They have produced thousands of electric Cars
competence comparison competition compromise
safety regulations technical regulations minimum requirements standard requirements
One of the major tasks of education is to discover the most promising students. In order to teach effectively, educators are requested to lay emphasis on one particular field. Some subjects have been over-emphasized in public schools. The progress of the society cannot merely rely on inventors.
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