help please with this question

English
Tutor: None Selected Time limit: 1 Day

how do I change this sentence to passive 

Elementary school textbooks use this concept with frequency. 

and how do I change this one to also to passive 

writers should use passive constructions in certain situations. 

Nov 10th, 2014

1)  This concept is used frequently in elementary school textbooks.

2)  Certain situations require writers to use passive construction.

Nov 10th, 2014

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Nov 10th, 2014
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Nov 10th, 2014
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