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...

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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