Ex. 2. Open the brackets, using the correct form of the Infinitive. I. (A, B)

1. He seems (to read) since morning. 2. She seems (to work) at his problem since she came here. 3. He appears (to know) French well. He is said (to spend) his youth in Paris. 4. The enemy was reported (to overthrow) the defence and (to advance) towards the city. 5. You seem (to look) for trouble. 6. They seemed (to quarrel). I could hear their angry voices. 7. They are supposed (to work) at the problem for the last two months. 8. Her ring was believed (to lose) until she happened (to find) it while cleaning the house. 9. They seemed (to wait) for ages.

1. He seems to have been reading since morning.

Explanation: The correct form of the infinitive here is "to have been reading," which indicates that he started reading in the morning and is still doing it.

2. She seems to have been working at his problem since she came here.

Explanation: The correct form of the infinitive here is "to have been working," which indicates that she started working on his problem when she arrived and is still doing it.

3. He appears to know French well. He is said to have spent his youth in Paris.

Explanation: The correct form of the infinitive here is "to know" and "to have spent." "To know" indicates that he has knowledge of French, while "to have spent" explains where he acquired this knowledge.

4. The enemy was reported to have overthrown the defense and advanced towards the city.

Explanation: The correct form of the infinitive here is "to have overthrown" and "to have advanced." These verbs show that the enemy successfully completed these actions in the past.

5. You seem to be looking for trouble.

Explanation: The correct form of the infinitive here is "to be looking." This indicates that the person is currently actively searching for trouble.

6. They seemed to be quarreling. I could hear their angry voices.

Explanation: The correct form of the infinitive here is "to be quarreling." This indicates that they were engaged in an ongoing argument or disagreement when the speaker heard them.

7. They are supposed to have been working at the problem for the last two months.

Explanation: The correct form of the infinitive here is "to have been working." This indicates that they started working on the problem two months ago and are still doing it.

8. Her ring was believed to have been lost until she happened to find it while cleaning the house.

Explanation: The correct form of the infinitive here is "to have been lost" and "to find." "To have been lost" explains that the ring was thought to be lost, and "to find" indicates that she unexpectedly discovered it while cleaning the house.

9. They seemed to have been waiting for ages.

Explanation: The correct form of the infinitive here is "to have been waiting." This indicates that they started waiting a long time ago and are still waiting.