Tell me about your bike.
( ( ( Tell me ) ( about ( your bike ) ) ) . )
(ROOT (S (VP (VB Tell) (NP (PRP me)) (PP (IN about) (NP (PRP$ your) (NN bike)))) (. .)))
Let me know about your bike.
( ( Let ( me ( know ( about ( your bike ) ) ) ) ) . )
(ROOT (S (VP (VB Let) (S (NP (PRP me)) (VP (VB know) (PP (IN about) (NP (PRP$ your) (NN bike)))))) (. .)))