Grammar of Infinitives:

Infinitives are verb forms that are typically preceded by the word "to" and are used to express purpose, intention, or action. They can function as nouns, adjectives, or adverbs in a sentence.

Examples of Infinitives:

1. Noun Infinitive: To read is enjoyable.
2. Adjective Infinitive: She has books to read.
3. Adverb Infinitive: He works hard to succeed.

Explanation Rules:

1. Formation: Infinitives are formed by adding "to" before the base form of the verb (e.g., to + verb).
2. Function: Infinitives can function as nouns, adjectives, or adverbs in a sentence.
3. No Tense: Infinitives do not have tense, and they are not affected by the subject of the sentence.

Exercise: Choose the correct form of the infinitive in each sentence.

1. She likes (to swim/swimming) in the ocean.
2. I need (to buy/buying) groceries for dinner.
3. His goal is (to run/running) a marathon next year.
4. We plan (to visit/visit) the museum this weekend.
5. It's important (to eat/eating) a balanced diet.
6. They decided (to take/taking) a trip to Europe.
7. She hopes (to win/winning) the competition.
8. He promised (to help/helping) with the project.
9. The cat wants (to sleep/sleeping) on the couch.
10. They love (to play/playing) soccer in the park.

Answers:

1. to swim
2. to buy
3. to run
4. to visit
5. to eat
6. to take
7. to win
8. to help
9. to sleep
10. to play