mizansinha007 1) I don't understand. 2) I have not understood. If you want formal, say I do not understand.
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mizansinha0071) I don't understand.If you want formal, say I do not understand. Contractions are informal, and #2 is not quite native.
2) I have not understood.
mizansinha007And I don't know the proper use of "as following"It’s not a set phrase. Maybe you’re thinking of