There are 8 word cards on the blackboard. On one side there are English words, and on the other side, there are Korean words. You see English words on the cards now....

I will turn the cards over then you can see Korean words. I have turned over the cards. Do you know the English words for the korean words?
#1, stand up. Read the English words for the Korean words one by one.

(Is the passage grammatical? Would you like to check the expressions and correct errors?)

Everything looks good. The only thing I would change, if anything, is instead of "word cards", I'd just put "cards" because then you explain the cards.

The passage is grammatically correct, but there is a minor inconsistency in terms of tense. Here is the corrected version:

"There are 8 word cards on the blackboard. On one side, there are English words, and on the other side, there are Korean words. You currently see the English words on the cards.

I will now turn the cards over, and you will be able to see the Korean words. Can you tell me the English words for the Korean words on each card?"

By providing this revised passage, it clarifies the intention and helps to improve the overall clarity of the message.