Off the top of my head- -used when you are plainly guessing
Example : Off the top of my head, this phone would be worth £300
Knowing him, he will be late/angry/excited-used when you are making a guess based on what you already know
Example : Knowing Bryan, he will probably take the train, he hates driving.
If I had to take a guess, I’d say- a guess made based on your opinion
Example : If I had to take a guess, I’d say he was over 40 years old
It’s difficult to say, but I think….. used when making a guess is quite difficult
Example : It’s difficult to say, but I think anyone can won this match now.
I wouldn’t be surprised if……you feel that a certain thing is quite possible
Example : I wouldn’t be surprised if he leaves his job, he is too stressed for the kind of work he does.
I bet…..you are more sure in your guess or estimate
Example : I bet he’s gonna ask me out tonight, he just can’t stop staring
We’re talking maybe…..-informal way of giving an approximate number
Example : We’re talking maybe 40000 sq feet to build this house upon
It’s somewhere in the ballpark of …-used mainly when guessing an amount of money
Example : She gets paid somewhere in the ballpark of 10 million dollars to host that show
Your guess is as good as mine- when u have no idea and u’d rather not guess, any guess can be correct or incorrect
Example : When someone says to you ..”Don’t even know if Mary will show up for the wedding..” and you have no idea , you just say..”well, Your guess is as good as mine”
We hope this English lesson has helped you in many ways to learn English expressions to talk about guessing and estimating in English.