元语否定作为一种标记否定，它的标记形式一般为由本句和义句构成的复句结构式。
As a kind of marked negation, metalinguistic negation is usually marked by the double-sentence structure, consisting of a basic negative sentence plus another positive or negative sentence.
国内外研究者大量的研究表明一般过去式通常难以被二语学习者习得。
Researchers at home and abroad have found that the English past tense can only be acquired at a later stage in the developmental pattern.
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