I am trying to help a friend of mine from Thailand with his English, and before I correct his usage of 'mean' I'd like to be able to explain the why and wherefore of what I am telling him. He often sends me messages that say things like "That mean..." and I can't for the life of me determine why that word requires an s in that context.
closed as off-topic by sumelic, TrevorD, user140086, NVZ, curiousdannii May 1 '16 at 0:56
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