Though both sentences seem to express the same idea, but in different words, the first one is a negative sentence.
尽管两句话，表达的意思差别不大，但是用了不同的词汇。第一句话就是个负面的表达。
You cannot have a negative sentence after unless because that would make the sentence a double negative and senseless.
在unless之后不能接否定句，因为这就造成了双重否定，句子没有意义。
The essay defines the scope of such a negative sentence pattern, describes its structural feature and expounds its main pragmatic function.
论文界定了这种否定句式的范围，描述了其形式构造特征，阐述了其主要的语用功能。
A declarative sentence "declares" or states a fact, arrangement or opinion. Declarative sentences can be either positive or negative. A declarative sentences ends with a period (.).
陈述句是对事实、安排或观点进行“声明”或陈述。陈述句可以是肯定句，也可以是否定句。陈述句以句号(。)结尾。
This sentence means that certain behaviors, phenomenon or opinions have been out of date, so to express a negative attitude or tone of the speaker.
这个句子的意思是某种行为、现象、看法已经过时了。表达说话人否定的态度或语气。
This sentence means that certain behaviors, phenomenon or opinions have been out of date, so to express a negative attitude or tone of the speaker.
这个句子的意思是某种行为、现象、看法已经过时了。表达说话人否定的态度或语气。
The essence of negative sentence pattern to express affirmative proposition is to link two negative forms together for a positive sense.
汉语表达肯定命题的否定句式的实质是连用两次否定形式并表达一个肯定意义。
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.
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.
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。
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