( ( If ( you ( are pregnant ) ) ) ( , ( ( ( avoid exposure ) ( to ( toxic chemicals ) ) ) . ) ) )
(ROOT (S (SBAR (IN If) (S (NP (PRP you)) (VP (VBP are) (ADJP (JJ pregnant))))) (, ,) (VP (VB avoid) (NP (NN exposure)) (PP (TO to) (NP (JJ toxic) (NNS chemicals)))) (. .)))
If you are pregnant, avoid exposure to toxic chemicals.
(ROOT (S (NP (DT A) (JJ pregnant) (NN woman)) (VP (MD should) (VP (VB avoid) (NP (JJ toxic) (NNS substances)) (SBAR (IN while) (FRAG (ADJP (JJ pregnant)))))) (. .)))