( ( ( The Microscope ) ( ( Most ( -LRB- ( ( ( but not ) all ) -RRB- ) ) ) ( ( plant cells ) ( are ( too ( small ( to ( observe ( with ( the ( unaided ( human eye ) ) ) ) ) ) ) ) ) ) ) ) ( , ( therefore ( we ( ( rely ( upon ( the ( microscope ( to ( ( assist us ) ( in ( observing ( individual cells ) ) ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (NP (DT The) (NN Microscope)) (SBAR (WHNP (NP (JJS Most)) (PRN (-LRB- -LRB-) (FRAG (CONJP (CC but) (RB not)) (NP (DT all))) (-RRB- -RRB-))) (S (NP (NN plant) (NNS cells)) (VP (VBP are) (ADJP (RB too) (JJ small) (S (VP (TO to) (VP (VB observe) (PP (IN with) (NP (DT the) (JJ unaided) (JJ human) (NN eye))))))))))) (, ,) (ADVP (RB therefore)) (NP (PRP we)) (VP (VBP rely) (PP (IN upon) (NP (DT the) (NN microscope) (S (VP (TO to) (VP (VB assist) (NP (PRP us)) (PP (IN in) (S (VP (VBG observing) (NP (JJ individual) (NNS cells))))))))))) (. .)))
The Microscope Most (but not all) plant cells are too small to observe with the unaided human eye, therefore we rely upon the microscope to assist us in observing individual cells.
(ROOT (S (NP (DT A) (NN microscope)) (VP (MD would) (ADVP (RBS best)) (VP (VB help) (S (NP (DT a) (NN person)) (VP (VB observe) (NP (NP (DT the) (NNS parts)) (PP (IN of) (NP (DT a) (NN plant) (NN cell)))))))) (. .)))