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Parts 1 and 4 (a)
Parts 1 and 4 (b)
Parts 2 and 3
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Mosaic 2 Grammar, 4/e
Patricia K. Werner
John P. Nelson
Breakthroughs

Parts 2 and 3

Write the verb in parentheses in the tense and voice given.



1

Future perfect, active voice
Within the next few years, companies (develop) several new drugs.
2

Future perfect, passive voice
Within the next few years, several new drugs (develop) .
3

Present perfect, active voice
Drug companies (develop) many new antibiotics since the 1950s.
4

Present perfect, passive voice
Many new antibiotics (develop) since the 1950s.
5

Past perfect, active voice
Until the 1950s, scientists (develop) few antibiotics.
6

Past perfect, passive voice
Until the 1950s, few antibiotics (develop) .
7

Present continuous, active voice
Today farmers (use) sophisticated machinery to plant and cultivate their farms.
8

Present continuous, passive voice
Today sophisticated machinery (use) to plant and cultivate farms.
9

Past continuous, active voice
A century ago, farmers (use) oxen to pull cultivators.
10

Past continuous, passive voice
A century ago, oxen (use) to pull cultivators.








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