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

C. farmers that it influences               D. why farmers influence it

3. By tracking the eye of a hurricane, forecasters can determine the speed at which ________.

A. is a storm moving                    B. a storm is moving

C. is moving a storm                    D. a moving storm

4. During the flood of 1927, the Red Cross, ________ out of emergency headquarters in Mississippi, set up temporary shelters for the homeless.

A. operates       B. is operating       C. has operated       D. operating

5. Of all the economically important plants, palms have been ________.

A. the least studied                      B. study the least

C. study less and less                   D. to study the less

6. During an eclipse of the sun, ________ in the shadow of the Moon.

A. the Earth lies