They are of similar word class and grammatical form. But their non-interrogative usages differ because of syntactic constraints.
而非疑问用法由于受到不同的句式制约，产生了不同的表达方式。
No syntactic constraints are imposed on the ways in which expressions can be composed (though the language does have some semantic constraints).
虽然语言具有语义约束，但对于表达式的构造方式却没有施加语义约束。
However, certain semantic constraints can be expressed as syntactic ones.
然而，某些语义约束可以表达为语法约束。
The processing in this case will evaluate not just the simple syntactic rules for XML documents in general, but also the specific grammatical constraints of the DTD.
这种情况下，处理将总体计算XML文档的简单句型规则，还将计算DTD的特定语法约束。
Grammars provide some constraints here, of course; but the study of selection among syntactic options falls within the fields of semantics, pragmatics, and register.
当然，语法会带来一些限制；不过，对句法选项的选择的研究属于语义学、语用论和术语范畴。
Analysis of predicate verb in a simple sentence is carried out based on the EICG constraints and shallow syntactic parsing results to get the syntactic and semantic structure of the whole sentence.
简单句结构分析以谓语动词为中心，依据其EICG格约束和句子浅层分析结果填充格框架，从而得到整个句子的语法语义结构。句子结构转换依照句子分析结果和转换规则产生等价的目标语言的线性语法语义结构。
Analysis of predicate verb in a simple sentence is carried out based on the EICG constraints and shallow syntactic parsing results to get the syntactic and semantic structure of the whole sentence.
简单句结构分析以谓语动词为中心，依据其EICG格约束和句子浅层分析结果填充格框架，从而得到整个句子的语法语义结构。句子结构转换依照句子分析结果和转换规则产生等价的目标语言的线性语法语义结构。
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