There's a meeting happening this afternoon at work. One of your team members asks if the meeting is mandatory. No one told you that the meeting was required, but you think that everyone is supposed to go. You answer:
Yeah, I think we're expected to be there.
"Yeah" means "yes" but is better for most conversational situations. It sounds more friendly than "yes". You can use it when speaking with friends or at work, but it's not common in writing.
In spoken English, you can say "I think ___" before the idea that you're thinking. In writing or when you're speaking carefully, you should use "I think that ___" instead.
When you "are expected" to do something, it means that people think that you're supposed to do it. These people might be your bosses, your coworkers, your parents, or your teachers. Saying that someone is "expected to" do something is just a little less strong than saying they "have to" do it.
To "be there" means to attend. You can say:
I'll be there.
This is the most natural way to say that you're going to come to an event, meeting, or party. This is a casual way of saying it. You wouldn't use this in writing, but it's common in business communication.
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