Excrise

　　Someone with a history of doing more rather than less will go into old age more congnitively sound than someone who has not had an active mind.

　　When building space on the ground becomes scarce use must be made of the space in the air.

　　When a consumer finds that an item she or he bought is faulty or in some way does not live up to the manufacturers claim for it, the first step is to present the warranty or any other records which might help, at the store of purchase.

　　要点：句首的someone后有介词短语with a history of doing more rather than less 对其进行修饰。第二个someone后有一个定语从句who has not had an active mind对其进行修饰。sound在此句中的意思为健康，健全。

　　译文:经常积极思考的人进入老年后,比不积极思考的人在认知方面更加健康.

　　要点：主句的谓语use must be made of the space in the air.是被动语态。在英语中动词+名词+介词类的短语将主动语态改为被动语态有两种改法。一种是将词组中的名词上升为主语;另一种是将介词后面的宾语升为主语。

　　举例：主语态：They take care of the babies.

　　被动态1 Care of the babies are taken by them.

　　被动态2The babies are taken care by them.

　　在本句中是采用了第一种做法，全句的主动语态为We must take use of the space in the air.

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