+23.+ We have learned from our study that we use sentences to express
our thoughts. These sentences are made up of words; therefore we call
words _parts of speech_. Words are only fractions or parts of speech,
and it is by combining them into sentences that we are able to express
our thoughts.
There are many thousands of words in the English language. It would be
impossible for us to study each word separately. But these words, like
people, are divided into classes, so we can study each class of words.
These thousands of words are divided into classes much as people are, or
rather as people ought to be; for words are divided into classes
according to the work which they do. In the Industrial Commonwealth
there will be no upper or lower class, but men will be divided into
groups according to the work which they do. There will be various
industrial groups, groups of agricultural workers, groups of clerical
workers, etc. So words are divided into classes according to the work
which they do in helping us to express our ideas.
+24.+ +Words are divided into kinds or classes according to their use in
sentences.+
+There are eight of these classes of words, called parts of speech.+