We will suppose to meet him at his office on Monday.
Is this sentence correct in business English?
No. '
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When you have to do something or you are expected to do something, you use the pattern "be supposed to". It's always supposed.
I'm supposed to ... / You're supposed to ...
He's supposed to ... / She's supposed to ...
We're supposed to ... / They're supposed to ...
This idiom is not used with modal verbs (can, could, will, would, ...