II. Open the brackets and choose the correct form of the verb:
1. We analyzed the data obtained after we (finished, had finished) our experiments.
2. We (discuss, will discuss) all the problems tomorrow.
3. If these two types of devices (were mixed, will be mixed) a compact and power-efficient product might be created.
4. Amplitude statistical characteristics (have discuss, have been discuss) already when considering measurement errors.
5. The exact operation of some devices (cannot rely on, cannot be relied on) due to their being slightly influenced by the changes in temperature.
6. If the circuit (possesses, will possess) no resistance, the back e.m.f. will be constant in magnitude.
7. The semiconductor specialists proved that this vertical structure (allows, allowed) the base to be doped with germanium to get the highest speeds.
8. By adding a heavily doped region below the collector contact the scientists believed that they (will achieve, would achieve, achieve) a low collector resistance.
9. The students (did, were doing) the laboratory works from 10 o’clock till 12.

1. We analyzed the data obtained after we had finished our experiments.
   Правильная форма — had finished (Past Perfect), потому что сначала мы закончили эксперименты, а уже потом проанализировали полученные данные. Первое действие в прошлом выражается Past Perfect, второе — Past Simple.

2. We will discuss all the problems tomorrow.
   Правильная форма — will discuss (Future Simple), так как действие произойдет завтра.

3. If these two types of devices were mixed a compact and power-efficient product might be created.
   Правильная форма — were mixed. Это условное предложение второго типа (Second Conditional), которое описывает возможную, но не фактную ситуацию в настоящем или будущем. Используется форма Past Simple в условии.

4. Amplitude statistical characteristics have been discussed already when considering measurement errors.
   Правильная форма — have been discussed (Present Perfect Passive), потому что характеристики уже были обсуждены. Здесь нужен пассивный залог: характеристики не сами обсуждали, а их обсуждали.

5. The exact operation of some devices cannot be relied on due to their being slightly influenced by the changes in temperature.
   Правильная форма — cannot be relied on. Устройство нельзя «положиться» — на него нельзя рассчитывать, поэтому нужен пассивный залог.

6. If the circuit possesses no resistance, the back e.m.f. will be constant in magnitude.
   Правильная форма — possesses. В условных предложениях первого типа (First Conditional) после if используется Present Simple, а не Future Simple.

7. The semiconductor specialists proved that this vertical structure allowed the base to be doped with germanium to get the highest speeds.
   Правильная форма — allowed. После глагола в прошедшем времени proved в косвенной речи обычно происходит согласование времен: Present Simple меняется на Past Simple.

8. By adding a heavily doped region below the collector contact the scientists believed that they would achieve a low collector resistance.
   Правильная форма — would achieve. После глагола в прошедшем времени believed будущее действие в прошлом выражается через would + verb.

9. The students were doing the laboratory works from 10 o’clock till 12.
   Правильная форма — were doing (Past Continuous), потому что действие продолжалось в определенный период времени в прошлом (с 10 до 12 часов).

Ответы:

1. had finished

2. will discuss

3. were mixed

4. have been discussed

5. cannot be relied on

6. possesses

7. allowed

8. would achieve

9. were doing