Expressing "the same" with 同样 and 同一
同样 and 同一 can have the same translation, but they are used differently.
The adjective 同样
同样 
is used to emphasize the similarity of actions or objects.
In a sentence, when 同样 is placed before a noun, it is considered to be a noun adjunct. This adjective is followed by the particle 的 .
is used to emphasize the similarity of actions or objects.
In a sentence, when 同样 is placed before a noun, it is considered to be a noun adjunct. This adjective is followed by the particle 的 .Scheme
同样
的
noun
Examples
我们做同样的工作，为什么工资不一样？
We are doing the same job. Why is our salary not the same?
wǒmen zuò tóngyàng de gōngzuò, wèishénme gōngzī bù yíyàng
上星期我也遇到了同样的事
I faced the same problem last week
shàng xīngqī wǒ yě yùdào le tóngyàng de shì
In a sentence, when 同样 is placed before a verb or an adjective, it is considered to be an adverbial adjunct meaning “equally”.
Scheme
同样
verb/adjective
Examples
他说英语和法语同样流利
He is equally fluent in English and French
tā shuō yīngyǔ hé fǎyǔ tóngyàng liúlì
在这次比赛中，不但马克踢得很好，玛莎也同样表现得不错
Not only Mark, but Masha also played this game well
zài zhè cì bǐsài zhōng, búdàn mǎkè tī de hěn hǎo, mǎshā yě tóngyàng biǎoxiàn de bú cuò
If 同样 is placed before a verb, the particle 地 can be placed after it.
can be placed after it.Examples
同样地对待大家
to treat everybody the same
tóngyàng de duìdài dàjiā
同样 cannot be a predicate.
For example, it can be used like this:
他们一样
But it can’t be used like this: 他们同样.
But it can’t be used like this: 他们同样.The adjective 同一
同一 is used to talk about the same object, person or quality.
is used to talk about the same object, person or quality. Pay attention
A measure word is placed between 同一 and a noun.
Scheme
同一
measure word
noun
Examples
我们在做同一件事情
We do the same thing
wǒmen zài zuò tóngyī jiàn shìqing
我们买了同一本书
We have bought the same books
wǒmen mǎi le tóngyī běn shū
他们是同一类人
These are the same people
tāmen shì tóngyī lèi rén
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