i'm not sure what the overnight low was
( i ( ( 'm not ) ( sure ( what ( ( the ( overnight low ) ) was ) ) ) ) )
(ROOT (S (NP (FW i)) (VP (VBP 'm) (RB not) (ADJP (JJ sure) (SBAR (WHNP (WP what)) (S (NP (DT the) (JJ overnight) (NN low)) (VP (VBD was))))))))
It was 37 degrees last night.
( It ( ( ( was ( 37 degrees ) ) ( last night ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBD was) (NP (CD 37) (NNS degrees)) (NP (JJ last) (NN night))) (. .)))