“I don't get what I'm supposed to do.”

English Lesson: I don't get what I'm supposed to do.

You're in a training session at your job. The trainer has given a long explanation of a new product, and then asks you to try it together with another person. You're confused about what exactly your task is.

I don't get what I'm supposed to do.

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I don't get (clause)

Use the phrase "I don't get ___" to talk about things that you don't understand:

I don't get it.

I don't get this movie.

You can follow "I don't get ___" with a clause that starts with a question word like "what", "why", "how", etc.:

I don't get why he said that.

I don't get what I'm supposed to do.

I don't get how this works.

what (something) is supposed to (do/be)

One of the ways to use the phrase "supposed to ___" is to talk about what a person intended, or what they were trying to communicate. 

For example, if you see a number written down, but it's not clear, you can ask:

Is this supposed to be an 8?

Or if your friend says something that might be critical of you, you can angrily ask:

What's that supposed to mean?

This means something like "Why did you say that?"