( ( For instance ) ( , ( ( some objects ) ( ( are ( so ( small ( that ( scientists ( must ( ( use ( powerful microscopes ) ) ( to ( see them ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NN instance))) (, ,) (NP (DT some) (NNS objects)) (VP (VBP are) (ADJP (RB so) (JJ small) (SBAR (IN that) (S (NP (NNS scientists)) (VP (MD must) (VP (VB use) (NP (JJ powerful) (NNS microscopes)) (S (VP (TO to) (VP (VB see) (NP (PRP them))))))))))) (. .)))
For instance, some objects are so small that scientists must use powerful microscopes to see them.
(ROOT (S (NP (DT A) (NN electron) (NN microscope)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB see) (NP (ADJP (RB extremely) (JJ small)) (NNS objects))))))) (. .)))