🔍 Infinitives

🔹 1. What Is an Infinitive?

An infinitive is the base form of a verb, often preceded by the word "to". It can function as a noun, adjective, or adverb in a sentence.

📌 Basic Form:

to + base verb → to run, to study, to be, to have

🧠 Note: The infinitive is not bound by tense or subject — it expresses an action or state in a general or abstract way.

🔹 2. Types of Infinitives

✅ 1. Full Infinitive (To-Infinitive):

She hopes to travel next year.

✅ 2. Bare Infinitive (without "to"):

Usually appears after certain verbs like let, make, see, hear, help, and modal verbs.

We heard him sing a song.
They must go now.

✅ 3. Perfect Infinitive:

to have + past participle — expresses an action completed before another.
He was sorry to have missed the meeting.

✅ 4. Continuous Infinitive:

to be + present participle (–ing) — for ongoing actions.
She seems to be working hard.

✅ 5. Perfect Continuous Infinitive:

to have been + present participle — for actions that were ongoing but completed before a certain point.
He claimed to have been waiting for hours.

🔹 3. Functions of Infinitives

• 1. As a Subject
  To learn a new language takes time.
• 2. As an Object
  She wants to become a doctor.
• 3. As a Subject Complement
  His goal is to win the championship.
• 4. As an Adjective (modifies a noun)
  She has a lot of work to do.
• 5. As an Adverb (modifies a verb, adjective, or adverb)
  He studies hard to succeed.
  We’re ready to begin.

🔹 4. Infinitives vs. Gerunds

Both infinitives and gerunds can function as subjects or objects. However, some verbs allow only one form:

I remembered to lock the door. (I didn’t forget)
I remember locking the door. (I recall the memory)

🔹 5. Common Verbs Followed by Infinitives

agree, appear, decide, expect, hope, learn, need, offer, plan, promise, refuse, seem, want, would like

They decided to leave early.

🔹 6. Infinitive Phrases

An infinitive phrase includes the infinitive plus its modifiers and objects.

He asked to see the manager immediately.
She needs to finish her project by Monday.

🔹 7. Split Infinitives (Advanced Style Note)

A split infinitive occurs when an adverb is placed between to and the verb. Though traditionally frowned upon, it is now widely accepted, especially for clarity or emphasis.

She decided to boldly go where no one had gone before.
✅ Acceptable in modern usage.

🔹 8. Infinitives after Question Words

Infinitives can follow question words (what, how, where, etc.) but not after a direct question.

I don’t know what to say.
He’s learning how to swim.

❌ What to do? → Use full clause: What should I do?

✅ Final Tips:

• Mastering infinitives includes knowing which verbs take infinitives vs. gerunds.
• Use perfect and continuous infinitives to express nuance in time and aspect.
• Pay attention to meaning changes with certain verbs (remember, stop, regret).
• Don’t avoid split infinitives if they clarify meaning.

⏎