How is the present perfect used

* It is commonly used in the introduction, particularly when you want to recapitulate the state of the art and show what work has been done and is still in progress. (See also Section 4.4 on the Passive Voice)

Recent progress in materials science, the development of new sophisticated application-designed materials, and especially the unique qualities of composite materials, have given a renewed interest in the problems arising when several different material phases interact with each other._

This chapter has provided you with career information that will help you decide whether or not to pursue a technical degree._

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