com certeza in English:

Definitely!

I know it's not true, but it definitely seems like the sun revolves around the Earth.

The position of women, over the years, has definitely changed for the better.

This is definitely, 'The good you do for others is good you do yourself'! It's a reward because I was helpful!

There is definitely a way to quit the world and live like an hermit in the mountains, being self-sufficient and without contact with anybody while not dying like a dog.

Look how tipsy she's gotten with just one drink. She definitely can't hold her liquor.

If you have no way to buy food, clothing, accommodation and other such daily necessities, you definitely won't be able to have peace of mind.

Okay, okay, said the doctor. "I'll definitely take a look at her."

He's definitely the right guy for the job. Let him fiddle with a computer and he perks right up.

I can't walk, but I can definitely hobble.

We definitely want to go abroad this summer. Ideally somewhere hot.

‘Was it what you expected?’ ‘Yes, definitely.’ Some old people want help; others most definitely do not.

If you compare the two photos, you can see he is definitely thinner in the earlier one.

"Do you want to come?" "Yes, definitely."

If it doesn't get better after two weeks, you definitely must get a medical exam.

Certainly.

Certainly she wouldn't have dreamt that I would get up promptly without grumbling.

Translation is like a woman. If it is beautiful, it is not faithful. If it is faithful, it is most certainly not beautiful.

For, in reason, all government without the consent of the governed is the very definition of slavery: but in fact, eleven men well armed will certainly subdue one single man in his shirt.

There's no telling what kind of trouble this proposal might stir up. The result is certainly going to be something to see.

I have often observed how little young ladies are interested by books of a serious stamp, though written solely for their benefit. It amazes me, I confess; for, certainly, there can be nothing so advantageous to them as instruction.

If you say "I was tricked," well that's certainly so but there's no mistaking that you were the one who signed up on a "sweet deal".

Certainly if someone is _that_ beautiful you'd draw back from approaching her. "Thought you'd agree."

In fact, there is a joke about passport photos: If you really look like the picture in your passport, you certainly need a vacation!

We've got taller so they don't fit. "Right, it's certainly not that we've got fat!" "The useful phrase 'grown up' is our trump card."

I had a nagging feeling that the atmosphere resembled somebody and, now that you mention it, yes, you're right. Certainly ZZ TOP had this kind of feel.

If there are genuine differences between these two cultures, I think that the largest are certainly in what you think about foreigners studying your native language.

Certainly there are inequalities in level of education even within a generation, but there have been no visible inequities between machines and materials in recent years.

The Koran, far from being inimitable, is a literary work of inferior quality, as it is neither clear, nor understandable, nor does it possess any practical value and is certainly not a revealed book.

The act known as terrorism, that rips away from us in an instant our peaceful days of happiness, is certainly worthy of being called an enemy to all mankind.