If you have any questions, please call me at 241-2661.
( ( If ( you ( have ( any questions ) ) ) ) ( , ( ( please ( ( call me ) ( at 241-2661 ) ) ) . ) ) )
(ROOT (S (SBAR (IN If) (S (NP (PRP you)) (VP (VBP have) (NP (DT any) (NNS questions))))) (, ,) (VP (VB please) (VP (VB call) (NP (PRP me)) (PP (IN at) (NP (CD 241-2661))))) (. .)))
You might not know what to do
( You ( ( might not ) ( know ( what ( to do ) ) ) ) )
(ROOT (S (NP (PRP You)) (VP (MD might) (RB not) (VP (VB know) (SBAR (WHNP (WP what)) (S (VP (TO to) (VP (VB do)))))))))