Do you know what a teja is?
( ( ( Do you ) ( know ( what ( ( a teja ) is ) ) ) ) ? )
(ROOT (SQ (VBP Do) (NP (PRP you)) (VP (VB know) (SBAR (WHNP (WP what)) (S (NP (DT a) (NN teja)) (VP (VBZ is))))) (. ?)))
He assumed I didn't know what a teja is. 
( He ( ( assumed ( I ( ( did n't ) ( know ( what ( ( a teja ) is ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD assumed) (SBAR (S (NP (PRP I)) (VP (VBD did) (RB n't) (VP (VB know) (SBAR (WHNP (WP what)) (S (NP (DT a) (NN teja)) (VP (VBZ is))))))))) (. .)))