Unit 3: The Tenses of Active and Passive Voices
I. Answer the questions about the difference between Active and Passive voices in English
What voice demands usage of transitive verbs only: Active or Passive one?
How to change the order of sentence members if you want to turn Active voice into Passive voice?
Is there any stylistic difference between the following sentences: “I prepared antiviral tea for the patient” and “Antiviral tea was prepared by me for the patient”?
II. Open the parenthesis paying special attention to the formation of the verb forms in Passive or Active voices.
Aloe Vera’s use can (to trace) back 6,000 years to early Egypt, where the plant (to depict) on stone carvings. Known as the “plant of immortality,” aloe (to present) as a burial gift to deceased pharaohs.
Historically, aloe (to use) topically (to heal) wounds and for various skin conditions, and orally as a laxative. Today, in addition to these uses, aloe (to use) as a folk or traditional remedy for a variety of conditions, including diabetes, asthma, epilepsy, and osteoarthritis. It (use) also topically for osteoarthritis, burns, sunburns, and psoriasis. Aloe Vera gel can (to find) in hundreds of skin products, including lotions and sunblocks. The Food and Drug Administration (FDA) (to approve) aloe Vera as a natural food flavoring.
Aloe leaves (to contain) a clear gel that often (to use) as a topical ointment. The green part of the leaf that (to surround) the gel can (to use) to produce a juice or a dried substance that is taken by mouth.
Unit 4: Modal Verbs and their Equivalents
Definition
Modal verbs are used to show the speaker’s attitude towards the action.
They have their own meaning and specific features. Can/could expresses ability; may/might – permission; shall/will/would – prediction; should/ought to – duty; must – total obligation; needn’t – no obligation.
Modals also have equivalents to express all component tenses: Present, Past and Future. Can – to be able to; May – to be allowed to; Must – have to, be to.
I. Fill in the gaps using correct forms of modal verbs. Make interrogative and negative sentences as in an example below:
I …..make a salt solution very quickly. – I can make a salt solution very quickly.
Can you make a salt solution very quickly?
No, I can’t do it.
1. You …know everything about variable composition of substances if you want to work in this sphere.
2. You …..use this Petri dish to prepare your solution.
3. We….start working at this chemical research as soon as possible.
4. I…..like to use various components for diffusion.
5. You …..be more attentive while working with flammable substances.
6. My assistant…..do the cleaning – I always do it by myself.