PRE-INTERMEDIATE Test 23

The telephone did not do the inventing; Bell did. So we need the passive, and in 1876 shows the past: was invented.

The thieves did the action, so we use the active voice. Last night is a finished past time, so we use the past simple: stole. Not have stolen, because the present perfect is not used with last night.

They did the action, so we use the active voice. Last week is a finished past time, so we use the past simple: sold. Not has sold, because they needs have, and the present perfect does not go with last week.

The factories did not build themselves, so we need the passive. This year is not finished yet, so we use the present perfect passive: have been built. Not was built, because factories is plural.

Cars do not produce anything; people produce them, so we need the passive. Next year is the future: will be produced. Not will produce, which is active.

The clue says Bell invented the telephone, not the television. So we need the negative past passive: wasn't invented.

Last year is finished past time, so the question uses the past simple: Did + subject + base verb, Did they make …?

Nylon did not invent itself; the chemist invented it. So we need the passive, and in the mid-1930s is past time: was invented. Not has been invented, because the present perfect does not go with a finished past time.

This is a finished action in the past story, so we use the past simple: worked. Not was working, because scientists is plural and needs were.

Nylon did not introduce itself; someone introduced it. So we need the passive, and the date 27 October 1938 is past: was introduced.

The story is in the past (It was cheap and strong), so we use the past simple: became. Is became is never correct.

People used nylon, so nylon was used: this is the past passive. During the Second World War is finished past time. Not has been used, because the present perfect does not go with a finished past time.

Today shows the present, and people find nylon in many things, so we use the present passive: is found. Not founded, which comes from found (to start an organisation).

For over 50 years shows an action from the past until now, so we use the present perfect: has played. Not played, because the past simple means the action is finished, but nylon is still important today.

Next year is the future, and nylon is made by people, so we use the future passive: will be manufactured. Not is going to manufacture, which is active.

People speak English; English does not speak. This is a general fact, so we use the present simple passive: is spoken.

By a loud noise shows the passive: the noise frightened the animals. So we say were frightened. Not has been frightened, because animals is plural.

By anyone shows the passive, and anyone goes with a negative: aren't helped (nobody helps them).

How many times asks about your experience up to now, so we use the present perfect passive: have you been hurt. Hurted is not a word; the past participle is hurt.

By anyone shows the passive, and anyone goes with a negative: weren't seen (nobody saw them).

The climate is too cold, so people do not grow coffee there. We use the negative present passive: isn't grown.

Someone waters the plants, so we need the passive. Last night is past: Were the plants watered? Not Have the plants been watered, because the present perfect does not go with last night.

After should we use the base form. In the passive this is be + past participle: should be banned.

Columbus did the action, so America was discovered by him. This is the past simple passive. Not had been discovered, because there is no other past event before it.

People will knock the house down, so we need the passive with going to: is going to be + past participle, to be knocked down.