将来完成时:
1.构成:shall / will have + 过去分词
2.功能:表示将来某时之前已经完成的动作。
►. They will have been here for 5 years next Friday.
►. By the end of next term, the students will have finished the book.
过去将来完成时:
1.构成:would / should have + 过去分词
2.功能:表示从过去某个时间看将来某时之前已经完成的动作。
►. He said that they would have arrived by seven o'clock.
将来完成进行时:
1.构成:shall / will have been + 现在分词
2.功能:表示某一动作将继续到将来某时,且该动作此时尚未发生。
►. We shall have been staying here for four weeks when Tom arrives.
►. It will have been raining for a week if it does not stop tomorrow.
[注:此句型过于复杂,人们很少运用,了解而已。]
测试精编(综合训练)
1. Simple photographic lenses can't ________ sharp, undistorted images over a wide field.
A. to form B. are formed C. forming D. form
2. Of all the factors affecting agricultural yields, weather is the one ________ the most.
A. it influences farmers B. that influences farmers
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