“I'm sure we can come to an agreement.”
A villain on a TV show wants to make the hero do something, so he has kidnapped the hero's girlfriend. The villain threatens the hero by saying this.
I'm sure we can come to an agreement.
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This is used when you're not 100% sure you will be able to do something, but you strongly predict that you will. For example:
I'm sure we can work something out.
This means that you think you will be able to find a solution to an issue.
This means that you think that your store will start to get a lot of customers again soon.
This phrase is useful in situations where you want to reassure the listener.
But it can also be used to threaten someone, like the villain in a TV show might do. In this case, you're saying that you strongly predict that the person you're threatening will agree with you, because if they don't, you will do something bad to them.
This means to make or finish an agreement in a negotiation.
Other words with similar meaning to "agreement" also use this structure:
come to a compromise
come to a consensus