Dear teachers,
Can I change the following Active Voice sentences to passive ? My local English teacher told me that it was not possible to change. Is this true? For sentence(b) below, which one is the subject ?
a) Can they build the house ? ( Active voice)
My answer : Can the house be built ( passive voice)
b) Is the killing of wild animals legal ?
My answer : Can wild animals be necessarily be killed ( passive)
On another sentence, is it correct to use a for the word " research" ? e.g. I am doing a research on noise pollution.
Thanks.