tung4 jat1同一

Jyutpingtung4 jat1

Yaletùhng yāt

區別詞Very common

Definition

Same; identical; being the very same one.

neutraldescriptions

How it's used

Functions exclusively as an attributive adjective to modify nouns, meaning it must be followed by a noun phrase. It carries a slightly more formal or emphatic tone compared to the more common colloquial term 一樣. While 一樣 can be used predicatively, 同一 cannot stand alone as a predicate.

Examples

keoi5佢dei6哋loeng5兩go3個zyu6住喺hai2同tung4一jat1間gaan1屋。

The two of them live in the same house.

nei5你dei6哋hai6係mai6咪heoi3去tung4同jat1一gaan1間hok6學haau6校duk6讀syu1書aa4呀？

Are you two going to the same school?

Common phrases

tung4同jat1一si4時gaan3間

at the same time

tung4同jat1一dou6道lei5理

the same logic

Common mistake

Learners often mistakenly use 同一 as a predicate, such as saying 呢兩樣嘢係同一, which is grammatically incorrect. Always ensure it is placed before a noun, like 同一樣嘢.