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” I don’t understand” :
Sorry I don’t quite follow…
I’m not sure I got that…
Sorry it’s not so clear….
I’m not with you…..
Do you mean……?
What do you mean…?
I don’t know what you mean…
Perhaps I have misunderstood…..
Ok this was just a quick look at this part of the English language.
More to follow on how to say the same thing in a variety of different ways, from formal to informal.
Good luck with your English learning.
Simon
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