Of course you only had a thousand students through all those six grades.
( ( Of course ) ( you ( only ( ( had ( ( a ( thousand students ) ) ( through ( all ( those ( six grades ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Of) (NP (NN course))) (NP (PRP you)) (ADVP (RB only)) (VP (VBD had) (NP (NP (DT a) (CD thousand) (NNS students)) (PP (IN through) (NP (PDT all) (DT those) (CD six) (NNS grades))))) (. .)))
They only had 100 students in the school.
( They ( only ( ( had ( ( 100 students ) ( in ( the school ) ) ) ) . ) ) )
(ROOT (S (NP (PRP They)) (ADVP (RB only)) (VP (VBD had) (NP (NP (CD 100) (NNS students)) (PP (IN in) (NP (DT the) (NN school))))) (. .)))