( There ( ( was ( no ( need ( to ( use ( an ( electron microscope ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBD was) (NP (DT no) (NN need) (S (VP (TO to) (VP (VB use) (NP (DT an) (NN electron) (NN microscope))))))) (. .)))
There was no need to use an electron microscope.
(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))))))) (. .)))