Know phrases that will help you Speculate in a conversation.
Informal: No doubt he is going to win.
Formal: In all probability, the award is yours.
Informal
I bet...
British
American
I suppose / expect...
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American
I guess / imagine...
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American
No doubt...
British
American
It's unlikely that...
British
American
Formal
It's possible / probable that...
British
American
My guess is that...
British
American
In all probability...
British
American
There's just a chance that...
British
American
I wouldn't be surprised if...
British
American