Adverbs of Probability 

Discover the rules for using adverbs of probability, like 'surely', 'clearly', and 'evidently'. Detailed explanations and a quiz to test your knowledge.

"Adverbs of Probability" in the English Grammar

What Are Adverbs of Probability?

Adverbs of probability are a type of adverb used to indicate the likelihood or probability of an event or situation occurring. They provide information about the speaker's or writer's degree of certainty or uncertainty about what is being discussed.

Most Common Adverbs of Probability

The most common adverbs of probability are:

definitely

certainly

maybe

possibly

perhaps

probably

likely

very likely

not likely

Adverbs of Probability: Structure

Many (but not all) adverbs of probability end with -ly. For example:

Example

It will probably take place at midnight.

You should certainly consider it.

But of course, there are some exceptions. Some of them are flat adverbs (also called bare adverbs or simple adverbs) and some others are formed by a preposition + a noun phrase:

doubtless

for sure

for certain

Example

Doubtless there would be lots of rumors.

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Adverbs of Probability: Placement

We usually place adverbs of probability before the main verb.

Example

They did everything they possibly could to save his life.

You definitely need a break.

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If the verb of the sentence is 'to be', adverbs of probability come after it.

Example

This is certainly not mine.

Diana is probably right.

Usually, 'perhaps' and 'maybe' are placed at the beginning of the clause.

Example

Maybe he'll come tomorrow.

Perhaps it will snow tomorrow.

Tip!

'Perhaps' can be used at the end of the sentence, but only in spoken English.

Example

We'll watch a movie, perhaps.

Adverbs of Probability: Uses

Here, you can see a list of the most common adverbs of probability arranged from the least likely to the most likely:

maybe

the least likely

perhaps

possibly

probably

likely

obviously

definitely

certainly

the most likely

Review

Adverbs of probability are used to express how certain we are about an event. They are used in different positions in the clause but mainly they are placed:

before the main verb

after the verb 'be'

sometimes at the beginning of the clause

Quiz:


1.

Choose the sentence that uses a flat adverb of probability.

A

He will probably be late.

B

They certainly missed the call.

C

Perhaps we should take a break.

D

You definitely need a rest.

2.

Sort the words to form a correct sentence.

cold
.
it
be
tonight
probably
will
3.

Which sentence correctly uses an adverb of probability in its proper position?

A

She will certainly finish the report on time.

B

Certainly she will finish the report on time.

C

She certainly will finish the report on time.

D

She will finish certainly the report on time.

4.

Match each incomplete sentence with the correct ending.

Perhaps
She will
They certainly
The results are
probably ready now.
understood the instructions.
probably arrive around noon.
they'll decide to join us later.
5.

Sort the adverbs based on level of certainty.

obviously
probably
certainly
possibly
maybe

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