Exercise 1: Change the following active sentences into the passive ones
1. We notice that the displacement changes between positive and negative values. ………………………………………………………………………………………… ………………………………………………………………………………
2. We can use the displacement - graph to find the period and frequency of the oscillation. ………………………………………………………………………………………… ………………………………………………………………………………
3. A placement – time graph can represent many oscillating systems. ………………………………………………………………………………………… ………………………………………………………………………………
4. If we compare the displacement –time and acceleration-time graphs, we’ll see that they are very similar to one another. ………………………………………………………………………………………… ………………………………………………………………………………
5. We can deduce the velocity graph from the displacement graph. ………………………………………………………………………………………… ………………………………………………………………………………
6. We say that these oscillations are damped. ………………………………………………………………………………………… ………………………………………………………………………………
7. Chemists have shown that if we mix iron ore with coal or charcoal, we’ll obtain iron. ………………………………………………………………………………………… ………………………………………………………………………………
8. We can extract elements from their compounds by spectroscopy. ………………………………………………………………………………………… ………………………………………………………………………………
9. We can not decompose the radioactive elements by ordinary heat, electricity, reaction with acids, and the like. …………………………………………………………………………………… ………………………………………………………………………………
10 . Since the 1960s, in medical scientists have used lasers in treating many diseases ……………………………………………………………………………………
1. We notice that the displacement changes between positive and negative values.
The displacemment is noticed to change between positive and negative values
2. We can use the displacement - graph to find the period and frequency of the oscillation.
The displacement - graph can be used to find the period and frequency of the oscillation
3. A placement – time graph can represent many oscillating systems.
Many oscillating systems can be represented by a placement - time
4. If we compare the displacement –time and acceleration-time graphs, we’ll see that they are very similar to one another.
If the displacement - time is compared with acceleration-time graphs, we will see that they are very similar to one another
5. We can deduce the velocity graph from the displacement graph.
The velocity graph can be deduced from the displacement graph
6. We say that these oscillations are damped.
These oscillations are said to be damped
7. Chemists have shown that if we mix iron ore with coal or charcoal, we’ll obtain iron.
It has been shown that if we mix iron ore with coal or charcoal, we’ll obtain iron.
8. We can extract elements from their compounds by spectroscopy.
Elements can be extracted from their compounds by spectroscopy
9. We can not decompose the radioactive elements by ordinary heat, electricity, reaction with acids, and the like.
The radioactive elements cannot be decomposed by ordinary heat, electricity, reaction with acids, and the like
10 . Since the 1960s, in medical scientists have used lasers in treating many diseases
Since the 1960s, lasers have been used in treating many diseases