S+Vt+O(to be)+OC(noun.adj)have given out how noun clauses /adj cl are involved in the following eg to be "check it out" by yourself:-eg:-
(1)sub+be+complement:-
eg:-The fact is that nobody is willing to answer your questions.
eg:-This house is what we are renting now.
eg:-There can be no doubt that he is a fool.
eg:-We heard a rumour that he killed some people.
eg:-It doesn't matter whether you learn or not.
(2) OC in adjective:-eg:-
It seemed quite happy that they are grammar students.
eg:-It appeared quite happy that they can join the competition in sc.
eg:-It is happy that the swimming team will show up.
eg:-It is a happy news that kk has failed out.
eg:-She agreed happily that her suggestion makes sense in College.
eg:-She boasted happily that she had been the beauty queen.
------If S+Vt+O(to be) +OC, then we've
eg:-Female students could decide quite happily where they would stay in the sc. hostel for 7 nights.