Exercise 1
Define the forms of the Infinitive (Passive or Active; Indefinite, Continuous, Perfect or Perfect Continuous) in the following sentences.

1.I want to see your design.
2.It can be done.
3.The mistake must be found.
4.We knew him to be working in the room.
5.They are likely to be being served now.
6.I remember to have seen her somewhere.
7.We thought the mistake to have been found.
8.He must have been working all night.
9.She appeared to have been leading a very busy life before.
10.It’s nice to be sitting here with you.
11.It’s good to have finished work for the day.
12.I’m sorry not to have come on Friday.
13.I appear to have made a small mistake.
14.I didn’t expect to be invited.
15.There is a lot of work to do.
16.There is a lot of work to be done.

Exercise 1

In this exercise, we are asked to identify the forms of the Infinitive (Passive or Active; Indefinite, Continuous, Perfect, or Perfect Continuous) in the given sentences.

1. I want to see your design.
- Form of the Infinitive: Active, Indefinite

Explanation: Here, the main verb "want" is in the active form, and the phrase "to see your design" is an infinitive phrase. In this sentence, the infinitive "to see" does not show any continuous, perfect, or perfect continuous aspect.

2. It can be done.
- Form of the Infinitive: Passive, Indefinite

Explanation: In this sentence, the main verb "can" is followed by the passive infinitive phrase "be done." The passive form is used because the subject ("It") is the recipient of the action.

3. The mistake must be found.
- Form of the Infinitive: Passive, Indefinite

Explanation: The main verb "must" indicates obligation or necessity, and it is followed by the passive infinitive phrase "be found." Again, the passive form is used because the subject ("The mistake") is the receiver of the action.

4. We knew him to be working in the room.
- Form of the Infinitive: Active, Continuous

Explanation: In this sentence, the main verb "knew" is followed by the active infinitive phrase "to be working." The infinitive "to be working" shows continuous aspect because it describes an ongoing action.

5. They are likely to be being served now.
- Form of the Infinitive: Passive, Continuous

Explanation: The main verb "are" is followed by the passive infinitive phrase "to be being served." The passive form is used because the subject ("They") is the receiver of the action. The continuous aspect is indicated by "being served," which describes the ongoing action.

6. I remember to have seen her somewhere.
- Form of the Infinitive: Active, Perfect

Explanation: In this sentence, the main verb "remember" is followed by the active infinitive phrase "to have seen." The infinitive "to have seen" shows perfect aspect because it indicates an action that is completed before the remembering took place.

7. We thought the mistake to have been found.
- Form of the Infinitive: Passive, Perfect

Explanation: The main verb "thought" is followed by the passive infinitive phrase "to have been found." The passive form is used because the subject ("The mistake") is the receiver of the action. The perfect aspect is indicated by "to have been found," showing that the action was completed before the thinking took place.

8. He must have been working all night.
- Form of the Infinitive: Active, Perfect Continuous

Explanation: In this sentence, the main verb "must" indicates strong probability or certainty, and it is followed by the active infinitive phrase "have been working." The infinitive "have been working" shows perfect continuous aspect, indicating an ongoing action that was completed before the time of speaking.

9. She appeared to have been leading a very busy life before.
- Form of the Infinitive: Active, Perfect Continuous

Explanation: The main verb "appeared" is followed by the active infinitive phrase "to have been leading." The infinitive "to have been leading" shows perfect continuous aspect, indicating an ongoing action that was completed before the appearance.

10. It's nice to be sitting here with you.
- Form of the Infinitive: Active, Continuous

Explanation: In this sentence, the phrase "to be sitting here with you" is an infinitive phrase that functions as the complement of the adjective "nice." The infinitive "to be sitting" shows continuous aspect, indicating an ongoing action.

11. It's good to have finished work for the day.
- Form of the Infinitive: Active, Perfect

Explanation: The phrase "to have finished work for the day" is an infinitive phrase serving as the complement of the adjective "good." The infinitive "to have finished" shows perfect aspect because the action of finishing the work was completed before the time of speaking.

12. I'm sorry not to have come on Friday.
- Form of the Infinitive: Active, Perfect

Explanation: In this sentence, the phrase "not to have come on Friday" is an infinitive phrase that serves as the complement of the verb "sorry." The infinitive "not to have come" shows perfect aspect, indicating the action of not coming was completed before the feeling sorry.

13. I appear to have made a small mistake.
- Form of the Infinitive: Active, Perfect

Explanation: The verb "appear" is followed by the active infinitive phrase "to have made." The infinitive "to have made" shows perfect aspect because the action of making the mistake was completed before the appearance.

14. I didn't expect to be invited.
- Form of the Infinitive: Passive, Indefinite

Explanation: In this sentence, the main verb "expect" is followed by the passive infinitive phrase "to be invited." The passive form is used because the subject ("I") is the receiver of the action.

15. There is a lot of work to do.
- Form of the Infinitive: Active, Indefinite

Explanation: The main verb "is" is followed by the active infinitive phrase "to do." The infinitive "to do" does not show any continuous, perfect, or perfect continuous aspect in this sentence.

16. There is a lot of work to be done.
- Form of the Infinitive: Passive, Indefinite

Explanation: In this sentence, the infinitive phrase "to be done" is used to indicate that the work is the action to be completed. The passive form is used because the subject ("lot of work") is the receiver of the action.

I hope this detailed explanation helps! If you have any further questions, feel free to ask.