. Correct the mistakes in the following sentences. Pay attention to the use of Simple, Progressive, Perfect (Active and Passive Voice)
tense forms.
1. Marconi has invented a wireless telegraph system in 1896.
2. Since 2014 Jane was working for MediaGroup, the biggest company in the region.
3. Professor Jonson was given a lecture on information technology at
11 a.m. tomorrow.
4. All the articles on biosensors will be translated by last Friday.
5. A new model of the printer is showing tomorrow.
6. System errors affects the computer or its peripherals.
7. Were they studying the operating systems next term?
8. Have you passed the exam on programming languages by 5 p.m.
tomorrow?
9. We has replaced copper lines with fiber-optic cables.
10. Semiconductors were made it possible to develop much smaller
portable radios.
11. The first version of Microsoft Windows were being introduced in 1985.
12. When I calling my friend he compiled a program.
13. Alexander will studied C and C ++ by next year.
14. Pavel is often being asked to make a report at conferences.

1. Marconi invented a wireless telegraph system in 1896.
Explanation: The correct verb form for the past tense of "invent" is "invented". We do not use "has" in this case because we are talking about a specific point in the past.

2. Since 2014, Jane has been working for MediaGroup, the biggest company in the region.
Explanation: The correct verb form to use here is the present perfect progressive "has been working" because the action started in the past (2014) and is still ongoing.

3. Professor Jonson will give a lecture on information technology at 11 a.m. tomorrow.
Explanation: The correct verb form to use here is the future simple tense "will give" because the action is scheduled to happen in the future.

4. All the articles on biosensors will have been translated by last Friday.
Explanation: The correct verb form to use here is the future perfect passive tense "will have been translated" because the translation will be completed before a specific point in the future (last Friday).

5. A new model of the printer will be shown tomorrow.
Explanation: The correct verb form to use here is the future simple passive tense "will be shown" because the action of showing the new model will happen in the future.

6. System errors affect the computer or its peripherals.
Explanation: The correct verb form to use here is the simple present tense "affect" because it is a general statement about what happens or is true.

7. Will they be studying the operating systems next term?
Explanation: The correct verb form to use here is the future progressive tense "will be studying" because the action of studying the operating systems will be in progress in the future.

8. Will you pass the exam on programming languages by 5 p.m. tomorrow?
Explanation: The correct verb form to use here is the future simple tense "will pass" because the action of passing the exam is scheduled to happen in the future.

9. We have replaced copper lines with fiber-optic cables.
Explanation: The correct verb form to use here is the present perfect tense "have replaced" because the action of replacing the copper lines with fiber-optic cables started in the past and is still relevant in the present.

10. Semiconductors made it possible to develop much smaller portable radios.
Explanation: The correct verb form to use here is the simple past tense "made" because we are talking about a specific point in the past when semiconductors made something possible.

11. The first version of Microsoft Windows was introduced in 1985.
Explanation: The correct verb form to use here is the simple past tense "was introduced" because the action of introducing the first version of Microsoft Windows happened in the past.

12. When I called my friend, he compiled a program.
Explanation: The correct verb form to use here is the simple past tense "called" because it indicates a completed action in the past.

13. Alexander will study C and C++ by next year.
Explanation: The correct verb form to use here is the future simple tense "will study" because the action of studying C and C++ will happen in the future.

14. Pavel is often asked to make a report at conferences.
Explanation: The correct verb form to use here is the simple present passive tense "is often asked" because this describes a repeated action in the present where Pavel is the receiver of the action.