Ex. 3 Put the verbs in brackets in the correct form in Past Simple. 1. This metal (to have) ____ a red colour yesterday.
2. Yesterday I (to obtain) _____ a new substance in the laboratory.
3. Two days ago I and my colleague from London (to study) _____the properties of nonmetals.
4. Last time we (to divide) ____ this substance into two substances.
5. This metal (not to gain) ____ an electron last time.
6. Yesterday this substance (to be) ___ red.
7. Last year we (to be) ____ students.
Ex. 4 Put the questions to the bold-typed words. 1. Chemists divided chemical elements into metals and nonmetals.
2. Nonmetals gained electrons. 3. Metals were brittle.
4. Nonmetals reacted with other substances.
5. This metal was red. 6. These metals had low densities.
7. These metals were poor conductors.
Ex. 5 Put the verbs in brackets in Past or Present Simple. 1. I (to study) ____ this substance every day.
2. I (to study) ___ this substance yesterday.
3. Last time this metal (to be soft) ____.
4. This metal (to be) ___ always soft.
5. Nonmetals often (to have) ___ open structures.
6. Last time this nonmetal (not to lose) ____ electrons.
7. This metal (to form) ___ oxides last time.
Ex. 6 Translate from English into Russian or Kazakh. 1. Chemists divided chemical elements into metals and non metals.
2. Metals have low melting and boiling points.
3. Metals didn’t react with acids.
4. Nonmetals didn’t form basic oxides.
5. What is a basic oxide?
6. Metals were brittle when they were solid.
7. Last time metals tended to gain electrons.
8. Nonmetals are poor conductors of heat.
