impregnable Non-English speakers have been known to think this means inconceivable.
( ( impregnable ( Non-English speakers ) ) ( ( have ( been ( known ( to ( think ( ( this means ) inconceivable ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ impregnable) (JJ Non-English) (NNS speakers)) (VP (VBP have) (VP (VBN been) (VP (VBN known) (S (VP (TO to) (VP (VB think) (S (NP (DT this) (NNS means)) (ADJP (JJ inconceivable))))))))) (. .)))
The misunderstanding has sometimes lead to frustration and arguments between English and non-English speakers.
( ( The misunderstanding ) ( ( ( has sometimes ) ( lead ( to ( ( ( frustration and ) arguments ) ( between ( English ( and ( non-English speakers ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN misunderstanding)) (VP (VBZ has) (ADVP (RB sometimes)) (S (VP (VB lead) (PP (TO to) (NP (NP (NN frustration) (CC and) (NNS arguments)) (PP (IN between) (NP (JJ English) (CC and) (JJ non-English) (NNS speakers)))))))) (. .)))