Practice probability words like likely, unlikely, bound, probably and definitely with B1+ level tests and exercises and clear grammar explanations.
Likely, Unlikely, Bound, Definitely, Probably: Probability Exercises
When we want to say how sure we are that something will happen, we often use the word “probability” in English. Using words like likely, unlikely, bound, definitely, and probably makes it easy to show different levels of certainty.
Likely and Unlikely
Likely means that something is very likely to happen.
Unlikely means that something is not likely to happen.
These words are often used with be + likely / unlikely + to.
Examples:
She is likely to pass the exam.
It is unlikely to rain this afternoon.
We can also use them before a main verb.
They will likely arrive late.
He will unlikely agree to the plan. (less common but possible)
Bound
You can say that something is bound to happen. It is stronger than likely and is often used in spoken English.
Structure:
be bound to + verb
Example:
If you keep practicing, you are bound to improve.
Bound often means that the outcome is natural or can’t be avoided.
Probably
It probably shows a medium to high level of certainty, but not 100%. It is one of the most common adverbs used to talk about how likely something is.
Position in the sentence:
- before the main verb
- after the verb be
Examples:
She will probably finish the project today.
They are probably tired after the trip.
Definitely
Definitely means that something is 100% sure or very close to it. It shows a lot of faith.
Position in the sentence:
- before the main verb
- after the verb be
Examples:
I will definitely call you later.
This is definitely the right answer.
Comparing Levels of Probability
From weakest to strongest:
Unlikely → Probably → Likely → Bound to → Definitely
When you know these differences, you can sound more accurate and natural when you share your thoughts or make predictions.
Common Mistakes to Avoid
- Don’t mix up likely and probably.
- Be likely to come after be, and probably is an adverb.
- Don’t use definitely if you’re not sure.
- Only use it when you’re sure you can.
In English, you need words like likely, unlikely, bound, probably, and definitely to talk about probability. They help you show how certain you are about what will happen in the future and what you think. You will learn to pick the right word for the right level of certainty if you practice and do exercises on a regular basis.
