“det.”在英语语法中是“determiner”的缩写，表示限定词。限定词是一类词，它们用于名词之前以限定其范围或数量。限定词包括定冠词、不定冠词、指示代词、所有格代词、量词等。
以下是一些常见的限定词示例：
定冠词(Definite Article)：
the (e.g., the cat)
不定冠词(Indefinite Article)：
a, an (e.g., a cat, an apple)
指示代词(Demonstratives)：
this, that, these, those (e.g., this book, those cars)
所有格代词(Possessive Adjectives)：
my, your, his, her, its, our, their (e.g., my book, their house)
量词(Quantifiers)：
some, any, much, many, few, little, several, all, no (e.g., some water, many people)
数词(Numbers)：
one, two, three, etc. (e.g., one apple, two cars)
疑问词(Interrogative Determiners)：
which, what, whose (e.g., which book, whose pen)
以上就是det.英语词性是什么的问题解答，而这些词在名词短语中起限定作用，可以帮助明确或限定名词的意义或数量。
