It was going to be a hot day. 
( It ( ( was ( going ( to ( be ( a ( hot day ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBD was) (VP (VBG going) (S (VP (TO to) (VP (VB be) (NP (DT a) (JJ hot) (NN day))))))) (. .)))
It was already hot and was going to get hotter.
( It ( ( ( ( ( was already ) hot ) and ) ( was ( going ( to ( get hotter ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VP (VBD was) (ADVP (RB already)) (ADJP (JJ hot))) (CC and) (VP (VBD was) (VP (VBG going) (S (VP (TO to) (VP (VB get) (NP (NN hotter)))))))) (. .)))