... poisonous.The food eaten by the mice was poisonous. REDUCED NON-DEFINING RELATIVE CLAUSES Relative [=adjective] clauses Necessary [=defining; restrictive] clauses Unnecessary [=non-defining] There ... the relative pronoun if possible 2) Reduction of relative clauses if possible. Of course, here relative pronoun will be omitted as well as some changes on the verb within the relative clause. ... you are absolutely right, because “The relative pronoun can be omitted ONLY in necessary [defining] adjective [relative] clauses.” Page 1 REDUCED RELATIVE CLAUSESWhat is called “reduction” is...