D. Change the verbs in brackets into the Past Simple ( affirmative, negative, interrogative). 1. John always (go) to the gym.

5. We (not/jump) into the swimming-pool.

2. Kevin (run) to school yesterday.

6.

she (study) biology last year?

3. It (begin) to rain.

7. What (you/drink) in the morning?

4. We (play) football for hours.
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1. + John always went to the gym
- John didn’t go to the gym
? Did John go to the gym ?
2.-We didn’t jump into the swimming pool
+ we jumped into the swimming pool
? Did we jump into the swimming pool
3. +Kevin ran to school yesterday
- Kevin didn’t run to school yesterday
?Did Kevin run to school yesterday
4. + she studied biology last year
- she didn’t study biology last year
? Did she study biology last year
5. + it began to rain
- it didn’t begin to rain
? Did it begin to rain ?
6. ?What did you drink in the morning?
7.- we didn’t play football for hours
+ we played football for hours
? Did we play football for hours

1. what are metals and what do we call metallurgy? materials most widely used in industry, the study of the production and properties of metals 2. why are most metals dense? the atoms are arranged regularly 3. why are metals malleable? the atoms can slide over each other. 4. what is malleability? atoms' sliding over each other. 5. what are grains? irregular crystals 6. what is alloying? adding small amounts of other metals 7. what is crystalline structure? regular arrangement of atoms 8. what do the properties of metals depend on? the properties of the metals depend on the size, shape, orientation, and composition of these grains. 9. what changes the size of grains in metals? quenching, tempering, or annealing 10. what are the main processes of metal forming? drawing, rolling, hammering and extrusion, but some require hot-working. 11. how are metals worked? using machine-tools such as lathe, milling machine, shaper and grinder 12. what is creeping? the slow increase in length under stress.