Basic English Grammar Module: Unit 2B. Independent Learning Resources
© Learning Centre University of Sydney. This Unit may be copied for individual student use.
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In the Discussion section the writer again uses the simple present to discuss
experimental findings that are generally accepted within the scientific community:
Among the lipid classes, cholestryl esters show the most striking increase in unsaturation, and
the proportion of cholesteryl ester show the most striking increase in unsaturation, and the
proportion of cholesteryl esters relative to the other lipids also rises (9, 10).
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Exercise 7
Answer the questions after the text.
There are two types of reproduction: asexual reproduction and sexual reproduction. In sexual
reproduction organisms produce special sex cells called gametes. These are male and female
and must combine in a process called fertilisation to produce new offspring. In asexual
reproduction there are no gametes produced and no fertilisation.
1.
What is the only tense used in this text?
..........................................................................................................................................
2.
Why do you think the writer uses only this tense?
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You can now check the answers in the Answer Key at the back of the unit.
Dostları ilə paylaş: 
