“I think I get the gist.”
You've just started at a new job at a restaurant. A coworker has been training you in how to enter customers' orders into the computer system. She asks if you understood. You say that you mostly understood.
I think I get the gist.
In spoken English, you can say "I think ___" before the idea that you're thinking.
I think I'm finished.
I think she's coming.
In formal writing or when you're speaking carefully, you should use "I think that ___" instead:
I think that we need to do a lot more testing before we release it to the public.
To "get the gist" of something means to understand it a little bit, or to understand the general idea of something. Use it like this:
A: Do you understand?
B: Yeah, I get the gist.
You can "get the gist" of things like:
- the idea of a T.V. show
- how to play a game
- how to do a task at work
It doesn't make sense to say that someone "gets the gist" of a large subject like mathematics or psychology.
If you want to name the topic that a person understands, use "of ___":
He got the gist of how to do it with just a couple of minutes of explanation.