Sentence improvement question (please help)
Could you please help me understand the question written below?
1.They should have calmly thought of the advantages that would accrue to them.
a)should have calmly think of
b) should have to calmly thought of
c) should have been calm in thinking about
The answer is (c) in my book.
But why not (d) be the correct answer? since "should have calmly thought of" is an active form.
I am confused between d and c.
2.Being given to understand that there is a vacancy of an assistant in the firm,an application was submitted by me.
My book says "I submitted an application" should replace the above.
But why? "an application was submitted by me" is an passive form and is also correct.
Could you please guide me where to use active and passive forms?
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