Lesson 22
biology
biography
biome
democracy
demonstrate
epidemic
geology
geography
geometry
archaic
microwave
psychology
archaeology
microscopic
political
metropolis
police
cosmopolitan
policy
politician
Challenge Words:
demographics
biodegradable
zoology
antibiotic
hemisphere
Grammar: Present and
Present participle verbs
-Present tense describes
and action that is
happening now
-Present participle tense
describes an action that
is ongoing
-To form the present
participle, use the
helping verb is, are, or
am and add the ending –
ing to the main verb
Grammar: Past and Past
participle verbs
-Past tense verbs
describe an action in the
past
-Past participle tense
describe an action that
was started in the past
but is ongoing or
continuous
-To form a past
participle, use the
helping verb has or have
and add the ending –ed
to the main verb