What is the difference between about and of?

'About' is used to talk about the subject or topic of something: 'a book about history,' 'I'm thinking about you.' 'Of' indicates possession, material, or relationship: 'the cover of the book,' 'made of wood,' 'a cup of tea.'

Is it 'think about' or 'think of'?

Both 'think about' and 'think of' are used, but they have slightly different meanings. 'Think about' means to consider or reflect on something: 'I'm thinking about moving abroad.' 'Think of' means to have an idea or recall something: 'I can't think of his name.'

Is it 'dream about' or 'dream of'?

Both are correct. 'Dream about' often refers to literal dreams while sleeping: 'I dreamed about you last night.' 'Dream of' often refers to hopes and ambitions: 'She dreams of becoming a doctor.'

About vs. Of: What's the Difference?

Quick Answer

About = the topic, subject, or concern: "a film about war," "worried about money"
Of = possession, content, composition, or relationship: "the end of the film," "made of glass," "a cup of coffee"

Main Uses of ABOUT

1. Topic or subject

"a documentary about climate change"

"Let's talk about the project."

2. Concern or worry

"I'm worried about my health."

"She's excited about the trip."

3. Approximate amount (= around)

"It costs about $20." / "I'll arrive about 3 o'clock."

Main Uses of OF

1. Possession / Belonging

"the capital of France" / "the door of the house"

2. Content / Amount

"a cup of tea" / "a bag of rice" / "a group of students"

3. Material / Composition

"made of wood" / "built of stone" / "composed of water"

4. After certain adjectives

"afraid of" / "proud of" / "tired of" / "fond of"

Verbs That Change Meaning: Think about vs. Think of

Verb + about	Meaning	Verb + of	Meaning
think about	consider, reflect	think of	recall, have an idea
dream about	literal dream while sleeping	dream of	hope or ambition
hear about	get news/information	hear of	know of the existence of

Examples

✔He wrote a book about his travels. (subject)

✔The beginning of the book is fascinating. (possession/part)

✘Tell me of your weekend. (topic = use "about")

✔Tell me about your weekend.

✘I'm afraid about dogs. (afraid takes "of")

✔I'm afraid of dogs.

Practice

Choose the correct word:

"Have you heard _____ the new restaurant that opened downtown?" (about / of)

Show answer

Answer: Have you heard about the new restaurant?

"Heard about" = received news/information about something. ("Heard of" = know that it exists.)

Related Grammar

Choose the whole expression, not just a translation

About often introduces a topic: a book about music. Of can express a relationship: a photograph of my sister. Learn combinations such as think about and think of in context; their meanings can overlap.

Practise the distinction

The cover ___ the book is blue.
Show answer and explanation
of
The cover belongs to or forms part of the book.
We talked ___ the journey.
Show answer and explanation
about
About introduces the topic of conversation.
Compare a photo of Paris and a book about Paris.
Show answer and explanation
The photo shows Paris; the book discusses Paris.
The preposition describes a different relationship.