(S (S (BASENP (NNP SKY) (NNP TV)) (VP (VP (VP (VBD had) (BASENP (NNS problems))) (ADVP (RBR earlier))) (PP (IN with) (S (BASENP (DT some) (NNS viewers)) (ADJP (JJ unable) (S (VP (TO to) (VP (VB tune) (PP (IN into) (BASENP (JJ certain) (NNS channels))))))))))) (PERIOD .))