“是”字句 The "是" Sentence

“是”字句是由“是”构成的判断句，用于表达人或事物等于什么或者属于什么。其否定形式是在“是”前加上否定副词“不”。例如：
A "是" sentence is a determinative sentence with "是", indicating what somebody or something equals or belongs to. The negative sentence is formed by adding the negative adverb "不" before "是". For example:

如果提问的人对某个事实或者情况有比较肯定的估计，为了进一步得到证实，就可以用这种疑问句提问。“是不是”一般用在谓语前面，也可以用在句首或者句尾。
If one raises a question and is somehow certain about a fact or situation, they can use this kind of question to confirm their guess. "是不是" (literally "yes or no") is usually used before the predicate or at the beginning or end of a sentence.