But fortunately they didn't.
( But ( fortunately ( they ( ( did n't ) . ) ) ) )
(ROOT (S (CC But) (ADVP (RB fortunately)) (NP (PRP they)) (VP (VBD did) (RB n't)) (. .)))
Thankfully, I found out recently that they didn't do it even though they said they would.
( Thankfully ( , ( I ( ( ( ( found out ) recently ) ( that ( they ( ( did n't ) ( ( do it ) ( even ( though ( they ( said ( they would ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Thankfully)) (, ,) (NP (PRP I)) (VP (VBD found) (PRT (RP out)) (ADVP (RB recently)) (SBAR (IN that) (S (NP (PRP they)) (VP (VBD did) (RB n't) (VP (VB do) (NP (PRP it)) (SBAR (RB even) (IN though) (S (NP (PRP they)) (VP (VBD said) (SBAR (S (NP (PRP they)) (VP (MD would)))))))))))) (. .)))