To be:
Article:
Modal verbs:
Nouns:
Agiectives:
Verbs:
Prepositions:
Pronouns:

to be: are, is, was, am
modal verbs: must, can
article: a, in, an, to
verb: understand, read, cut, ask 
nouns: car, snow, girl, bag, cat
agiectives: beautiful, red, tall, important, big 
prepositions: between, on
pronouns: I, you, she, this, these