I am sure of

USAGE SUMMARY

The phrase "I am sure of" is correct and usable in written English.
You can use it when expressing confidence or certainty about something. Example: "I am sure of my decision to pursue a career in medicine."

✓ Grammatically correct

News & Media

Science

Human-verified examples from authoritative sources

Exact Expressions

59 human-written examples

What I am sure of is that all lovers of the arts surely have to be pleased that multiplexes as well as arthouses are showing some of our greatest actors, singers and dancers in treasured performances that will be preserved.

Independent

"I am sure of that".

The New Yorker

"I am sure of it".

The New York Times

"I am sure, of course," he said.

Independent

I am sure of this.

The Guardian

Here I am sure of my life.

The New York Times - Magazine

I am sure of its success".

The Guardian

I am sure of two things.

The Guardian

There are only three dates I am sure of.

The New Yorker

There is only one thing I am sure of.

The New York Times

We will sort it, I am sure of that".

The Guardian - Sport

Expert writing Tips

Best practice

Use "I am sure of" to express a firm belief or conviction based on evidence or understanding. Avoid using it when you have doubts or are speculating.

Common error

While "I am sure of" is acceptable, overuse can make your writing sound repetitive. Vary your language by using synonyms such as "I am certain", "I am convinced", or "I have no doubt" to maintain reader engagement.

Linguistic Context

The phrase "I am sure of" functions as an declarative expression of certainty. It's used to convey a firm belief or conviction about a particular fact, situation, or outcome. Ludwig provides various examples where this phrase appears in diverse contexts, reinforcing its function.

Expression frequency: Very common

Frequent in

News & Media

68%

Science

20%

Formal & Business

5%

Less common in

Wiki

4%

Encyclopedias

2%

Reference

1%

Ludwig's WRAP-UP

In summary, "I am sure of" is a versatile and frequently used phrase to express confidence or certainty. As Ludwig confirms, the phrase is grammatically correct and appropriate for various contexts, including news, media, and general conversation. While it's important to use it accurately, conveying genuine conviction, be mindful of overuse by using alternatives such as "I am certain of" or "I have no doubt about".

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

I am certain about

Replaces "sure" with "certain" maintaining a similar level of confidence but changes the preposition.

I am convinced of

Emphasizes a stronger belief, implying a persuasion based on evidence or reasoning.

I have no doubt about

Expresses certainty by negating doubt, creating a slightly more emphatic tone.

I am positive about

Uses "positive" instead of "sure", conveying a confident and optimistic certainty.

I feel confident about

Shifts the focus to a feeling of confidence, rather than a statement of certainty.

It is my firm belief that

Introduces a subjective opinion with a strong sense of conviction.

I am assured that

Implies that someone else has provided information that has made you sure.

I ascertain that

Indicates a discovered fact with certainty, implying effort in finding out.

I can guarantee

Offers a strong assurance, often used in situations where one has control over the outcome.

I am willing to bet

Expresses confidence through a colloquial idiom, suggesting a high degree of certainty.

FAQs

How can I use "I am sure of" in a sentence?

Use "I am sure of" to express confidence or certainty about something. For example, "I am sure of my facts" or "I am sure of his honesty".

What can I say instead of "I am sure of"?

You can use alternatives like "I am certain of", "I am convinced of", or "I have no doubt about" depending on the context.

Which is correct, "I am sure of it" or "I am sure about it"?

Both are correct, but "I am sure of it" is generally more common. "I am sure about it" implies a slightly less definitive certainty.

What's the difference between "I am sure of" and "I am confident in"?

"I am sure of" typically refers to a specific fact or piece of information. "I am confident in" often refers to someone's ability or the likelihood of a successful outcome.