Put the verb into the correct form, Past Perfect (I had measured) or Past Simple (I measured)

For example:

– Was Mike in the laboratory when you came?

– No, he (obtain) the results of the tests and (go) home.

1. I had a lot of energy when I started my work, so I … (begin, carry out) a new experiment.

2. The vacuum tube was full of mist when I got into the laboratory. Electrons … (form) a cloud around the cathode in a vacuum tube.

3. Sorry, but yesterday’s presentation of home appliances wasn’t too interesting for me, because I … (test) the electron device of the new generation a few months ago.

4. We were employing a new method when we … (see) something … (go) wrong, so we … (stop) to do it.

6. Complete these sentences with the following verbs (in the form of Past Perfect Passive): change, know, analyze, use, install.

1. Belarusian “Silicon Valley” was built after the international experience … in details.

2. Some parameters of the main machine … by a laboratory assistant before the professor came in.

3. There was a big storm last week and the city remained without electricity. Hundreds of patients didn’t die, because autonomous storage batteries … in the hospital.

4. We learnt about laser printers only a few years ago. Ink-jet printers … earlier.

5. The typewriter … to input data, before a computer was invented.

Rewrite these sentences into Past Perfect Passive/Active.

1. When at the master’s course all modern books were available for us, because electronic catalogs (create) earlier.

2. Before compact discs were designed diskettes (create).

3. We could easily buy energy efficient lamps in a special shop, because Edison (invent) a usual lamp.

4. We (eat) more natural food, before scientists created GMO.

5. Awesome interactive toys (develop) so we could present our children with them.

6. I (repaire) this equipment before you came.

7. After the new device (test) by the professor, it was installed in our laboratory.

Choose as many words from the table of ex.1 as you can and form sensible sentences. Use Past Perfect where possible.

For example: I must add that this material has one very important feature.

9. Form adjectives from the following verbs using the suffix -able and translate them:

measure, move, obtain, compare

For example: control – управлять; controllable – поддающийся управлению.