Complete these sentences with the passive form
of the verbs given in the correct tense.
1 A millisecond (define) as a
thousandth of a second.
2 Philosophy (invent) by the Greeks.
3 I don’t think the study
(publish) yet.
4 I haven’t got a mobile phone – mine
(fix) at the moment.
5 Who knows when the problem
(solve). Soon, I hope.
6 Galileo’s discoveries (inspire) by
his study of nature.

1. A millisecond is defined as a thousandth of a second.

Explanation: In this sentence, we need to use the passive form of the verb "define" in the correct tense. The subject is "a millisecond," and we want to emphasize the action being done to it rather than who is performing the action. Therefore, we use the passive form "is defined."

2. Philosophy was invented by the Greeks.

Explanation: In this sentence, we need to use the passive form of the verb "invent" in the correct tense. The subject is "philosophy," and we want to highlight who performed the action rather than the action itself. Therefore, we use the passive form "was invented."

3. I don’t think the study has been published yet.

Explanation: In this sentence, we need to use the passive form of the verb "publish" in the correct tense. The subject is "the study," and we want to show that the action of publishing has been done to it. Therefore, we use the passive form "has been published."

4. I haven’t got a mobile phone – mine is being fixed at the moment.

Explanation: In this sentence, we need to use the passive form of the verb "fix" in the correct tense. The subject is "mine," and we want to express that the action is being done to it. Therefore, we use the passive form "is being fixed."

5. Who knows when the problem will be solved. Soon, I hope.

Explanation: In this sentence, we need to use the passive form of the verb "solve" in the correct tense. The subject is "the problem," and we want to focus on when the action will be done rather than who will do it. Therefore, we use the passive form "will be solved."

6. Galileo’s discoveries were inspired by his study of nature.

Explanation: In this sentence, we need to use the passive form of the verb "inspire" in the correct tense. The subject is "Galileo's discoveries," and we want to emphasize what caused the discoveries rather than who performed the action. Therefore, we use the passive form "were inspired."