Sentence 39: Rewrite the second sentence so that it has a similar meaning to the first one, using the words given or as instructed. We are interested in the problem. It has been discussed in the class (Use relative clause) => The problem_________

Knowledge: Relative clauses

The common noun of the two sentences is “the problem” (it).

How to change: Choose sentence 1 as the main clause because “the problem” (it) is the subject. Since “it” (the problem) is the object in sentence 2, we drop “the problem” and add which at the beginning of sentence 2 and then put the newly created relative clause after the noun “the book” in sentence 1.

=> The problem which we are interested in has been discussed in the class.

The issue we are interested in has been discussed in class.