[Grammar] I thought that...

Hi there,

Which one is correct?

I thought that we were having class next week.
I thought that we would have class next week.
I thought that we were going to have class next week.
I thought that we had class next week.

Thanks so much for your help!

confusednative said:

I thought that we were having class next week.
I thought that we would have class next week.
I thought that we were going to have class next week.
I thought that we had class next week.

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All four are possible, though they don't convey exactly the same meanings.