The usage of the focus marker is limited.
焦点标记“是”也有一定的使用限制，弱于对比重音对焦点的标记。
参考来源 - 论汉语对比焦点标记“是”·2,447,543篇论文数据，部分数据来源于NoteExpress
It is generally accepted that Shi evolved from a pronoun to a assertive copular and to a focus marker.
“是”从代词演变为断定系词，进而成为焦点标记，是语法界普遍接受的事实。
It holds that the exclamatory center of an exclamation is the focus of the sentence, and the exclamatory marker is the focus marker.
文章认为，感叹句的感叹中心即为句子焦点，而感叹标记则为感叹句的焦点标记。
The paper explains 'lái' with the structure of information, using the theory of focus to prove that they have the same function and are the focus marker of the sentence.
笔者从信息结构的角度，应用焦点理论对上述两句中的“来”作出了统一的解释，证明“来”是句子的焦点标记。
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