It was always warm.
( It ( ( ( was always ) warm ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBD was) (ADVP (RB always)) (ADJP (JJ warm))) (. .)))
Its temperature was always pretty warm.
( ( Its temperature ) ( ( ( was always ) ( pretty warm ) ) . ) )
(ROOT (S (NP (PRP$ Its) (NN temperature)) (VP (VBD was) (ADVP (RB always)) (ADJP (RB pretty) (JJ warm))) (. .)))