I am due to speak at a meeting at two o'clock.
( I ( ( am ( due ( to ( speak ( at ( ( a meeting ) ( at ( two o'clock ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP am) (ADJP (JJ due) (S (VP (TO to) (VP (VB speak) (PP (IN at) (NP (NP (DT a) (NN meeting)) (PP (IN at) (NP (CD two) (RB o'clock)))))))))) (. .)))
This afternoon I am due to speak at the meeting.
( ( This afternoon ) ( I ( ( am ( due ( to ( speak ( at ( the meeting ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (DT This) (NN afternoon)) (NP (PRP I)) (VP (VBP am) (ADJP (JJ due) (S (VP (TO to) (VP (VB speak) (PP (IN at) (NP (DT the) (NN meeting)))))))) (. .)))