I can't understant the difference below.

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Jul 14, 2012 06:05
There are two plases, I read them today, but I can't understand them. What's the difference between two sentences?

"We needn't have driven sofast."
Did we drive fast? Yes, we drove fast.
Was it necessaty? NO, it wasn't necessary.

"We didn't need to drive so fast."
Did we drive fast?
No, we didn't drive fast.
Was it necessary? No it wasn't ncessary.