no matter what 只能引导状语从句,不能句首引导名词性从句(例如主语从句,宾语从句)
而whatever 既可以引导状语从句,又可以引导名词性从句,用途较广。
例1:No matter what you say is of no importance now.(错)
Whatever you say is of no importance now.(对)
例2:No matter what happened ,he would not mind.
Whatever happened ,he would not mind.
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