Possible, I suppose, but if the phones weren't working, he couldn't have, could he?
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LcchangI wonder why c isn't a good one too?Yikes! "I could have called you sooner" > "I was able to call you".
LcchangIf I had gone to the party, I could have seen her there.=> I didn't go to the party, so I didn't see her.Yes, this is true, but in this case, the clause with could occurs only under the condition mentioned in the if-clause.