I Will Surely Finish this Blog Before Sundown
Adverbs of Certainty state how sure we feel about an action or event. For example:
“I will surely finish writing this blog before sundown.”

The above Adverb of Certainty, “surely” says that I’m 100% certain that I will come to the end of this little English article before the sun goes down. Other examples of Adverbs of Certainty include:
Definitely
Undoubtedly
Certainly
Probably
The List
What are some well-known examples of Adverbs of Certainty? Here are a few of them
Word: Definitely
Definition: Without a doubt
Pronunciation: dɛfɪnətli
Example: The Comedian Steven Wright said, “If at first, you don’t succeed, then skydiving definitely isn’t for you.” By using the Adverb of Certainty “definitely,” he emphasized the fact that jumping from an airplane has no room for error.
Word: Undoubtedly
Definition: Something that is true
Pronunciation: ʌnˈdaʊ.tɪd.li
Example: The Mountaineer Edmund Hilary, a person who explores remote mountains, said about his partner, “I have never regarded myself as a hero, but Tenzing undoubtedly was.”
Hilary and Tenzing Norgay were the first to successfully climb Mount Everest. By using the Adverb of Certainty “undoubtedly,” Hilary emphasized the fact that he isn’t a “hero,” but his friend Tenzig is.
Word: Certainly
Definition: In no doubt
Pronunciation: sər-tᵊn-lē
Example: The American Historian Mary Ritter Beard said, “Certainly, travel is more than the seeing of sights; it is a change […] in the ideas of living.” By using the Adverb of Certainty “certainly,” Beard emphasized the fact that travel causes a change deep within the traveler. The traveler takes insights and new ways of living.
Word: Probably
Definition: Something is likely to happen
Pronunciation: prɒbəbli
Example: There is a traditional saying that says that “anything that works like magic probably isn’t real.” By using the Adverb “probably,” the saying emphasizes the fact “magic” isn’t a solution for our problems.
Examples of the Adverbs of Certainty
- Martha definitely passed the test.
- He is probably going to be late again.
- Our class president is undoubtedly a great leader.
Let’s practice
Q1: Try making your own sentence.
Q2: Using definitely, tell me about your plans for the next year.
Q3: What do you think will probably happen if we don’t find a cure for the Coronavirus soon?
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