Hi, I got this situation that i need to come up with some expression as below during the conversation with my friend about his online course. He studies online classes and i just wanted to ask him if there is any fixed schedule for the class or if he just gets online casually for the class. So what i wonder is if the underlined sentences are correct, or your better suggestions will be appreiated because i am pretty sure there must be some better expressions for what i really mean.
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