(S (S (ADVP (BASENP (NN Two) (NNS weeks)) (RB ago)) (COMMA ,) (S (PP (IN on) (BASENP (NNP February) (JJ 1st))) (COMMA ,) (S (BASENP (PRP it)) (VP (VBD was) (NP (BASENP (DT the) (JJ second) (NN day)) (PP (IN of) (NP (DT the) (NP (JJ national) (NP (JJ environmental) (NP (S (VP (NNP Focus) (BASENP (DT the) (NNP Nation)))) (NN teach-in))))))))))) (PERIOD .))