Simple Tenses. (revision) tense active Voice Passive Voice present V, v+s am (is, are) + v3 Past v2 was (were) + v3 Future

(REVISION)

Tense	Active Voice	Passive Voice
Present	V, V+s	am (is, are) + V3
Past	V2	was (were) + V3
Future	will (shall) + V	will (shall) + be + V3

Ex. 4. Insert the correct forms of the verbs and translate the sentences into your native language:

1. Immune system (to design) by nature millions of years ago to aid the body in recovering from injuries and illnesses. 2. The lymph (to flow) from the capillaries in all parts of the body into the lymphatic vessels. 3. Although we (to inhale) and (to eat) thousands of germs every day, the immune system (to prevent) the spread of various diseases. 4. We (to bear) with a genetically based natural defense system. 5. Diabetes (to occur) when the cells in the pancreas are destroyed. 6. Your immune system (to need) help to function at the highest capacity. 7. Sticky mucus in respiratory and gastrointestinal tracts (to trap) many microorganisms.

Ex. 5. Determine the tense-forms of the predicates in the following sentences:

1. Foreign substances enter the body and cause the manufacture of antibodies. 2. Various bacteria live in the nose and mouth. 3. An anaerobe is a microorganism that can live without oxygen, while an aerobe requires oxygen. 4. Some macrophages are concentrated in the lungs, liver, lining of the lymph nodes and spleen. 5. B cells are produced in the stem cells of the bone marrow. 6. Phagocytes dissolve and destroy bacteria, viruses, and fungi. 7. The lymph nodes are usually distributed in groups.

Дата добавления: 2015-07-11