average , at best , i 'm afraid . 
(ROOT (S (ADJP (JJ average)) (, ,) (ADVP (IN at) (JJS best)) (, ,) (NP (PRP i)) (VP (VBP 'm) (ADJP (JJ afraid))) (. .)))
(ROOT (S (ADJP (JJ )) (, ) (ADVP (IN ) (JJS )) (, ) (NP (PRP )) (VP (VBP ) (ADJP (JJ ))) (. )))