GRAMMAR Point. 2.1.Write down the verbs in the proper form according to the number and the person of the subject

(speaking-writing)

2.1.Write down the verbs in the proper form according to the number and the person of the subject. Use the Present Simple tense:

Model: soil plays – soils play

2.2. Use the verbs to be or to have in the proper form of Present Simple:

1. Each mineral (to be) a chemical compound with specific chemical and physical properties.

2. The weathering of a rock (to be) due to a combination of physical and chemical actions.

3. Soil (to be) a mixture of organic and inorganic material.

4. Soil may (to have) various characteristics according to the nature of the parent material.

5. The weathered products of rock (to be) not enough to form a soil.

2.3. Use the proper form of the construction “there + to be” in Present Simple:

1. … several factors necessary for soil formation.

2. … changing temperatures, moisture and other factors which take part in the process of decomposition of igneous rocks.

3. … one important factor – fertility of soil – which differentiates it from rock.

4. … a distinction between a fertile and a rich soil.

5. … a lot of measures which may turn poor soils into fertile.

2.4.Use the verbs in brackets in the proper form of Present Simple:

1. Our task (to be) to make good use of soil.

2. People must (to have) a thorough knowledge of the processes governing the formation of soil.

3. Any step we take towards amelioration (to bring) about deep changes in the soil.

4. Plants and microorganisms (to play) a decisive role in the process of soil formation.

5. Fertility (to develop) in the process of soil formation.

2.5.Transform the verbs into Past Simple:

1. As a result of man’s labour, the soil acquires an exceptional capacity for displaying effective fertility.

2. Over a long time, the soil becomes richer and its fertility increases.

3. To raise the fertility up to the required level is possible only through the adoption of a combination of measures.

4. The natural fertility of soils changes.

5. In the chornozem zone we find the most favourable combination of factors and conditions for soil formation.

2.6.Ask questions to the following sentences:

1. All the factors necessary for plant life are of equal significance.

2. Relatively rich soils, like swamped or dry, possessed little or no fertility.

3. Potential fertility developed together with the soil.

4. The soil always holds in itself resources to increase fertility.

5. Raising of soil fertility constitutes the most important problem of soil science.

2.7.Correct the mistakes in the following sentences:

1. Agronomy be a branch of agriculture.

2. This branch of agriculture treat of the principles and practice of crop production and field management.

3. Our farms is able to obtain high yields of crops and animal produce.

4. Agronomists should working in close contact with science.

5. Parks are called the lungs of the town as they refreshed the air.

Step 3