“Again” with 又 and 再
There are several ways to express the meaning “again", "once more” in Chinese. Let's look at the adverbs 又 and 再.
The adverb 又
又 
is used for an action or a state that already happened. It comes before a predicate expressed by a verb.
is used for an action or a state that already happened. It comes before a predicate expressed by a verb.Scheme
subject
又
predicate
(object)
Examples
他又输了！
He lost again!
tā yòu shū le
上个星期我买了一双鞋子，昨天又买了一双
Last week I bought a pair of shoes, and yesterday I bought another one
shàng ge xīngqī wǒ mǎi le yì shuāng xiézi, zuótiān yòu mǎi le yì shuāng
又 can emphasize that the action has already been repeated several times. In this case we should use the pattern:
Scheme
subject
predicate
了
又
predicate
Examples
我找了又找，但是没找到
I searched and searched, but could not find it
The adverb 再
再 has the same meaning. However we usually use 再 for an action or a state yet to happen.
has the same meaning. However we usually use 再 for an action or a state yet to happen.Scheme
subject
再
predicate
(object)
Examples
你只吃了一点点饭，再吃一点吧
You have only eaten a little bit. Eat some more
nǐ zhǐ chī le yìdiǎndiǎn fàn, zài chī yìdiǎn ba
那个新商店我昨天去了一次，明天还想再去一次
I went to that new store yesterday and I want to go there again tomorrow
nà ge shāngdiàn wǒ zuótiān qù le yí cì, míngtiān hái xiǎng zài qù yí cì
We also can use 再 with negative particles to express “never again”.
To speak about the future we should say 再也不 .
To speak about the past we should say 再也没 .
.
To speak about the past we should say 再也没 .Examples
我再也不跟你说话！
I will never talk to you again!
wǒ zài yě bù gēn nǐ shuōhuà
从此他再也没相信过人们
Since then he has never trusted people again
cóngcǐ tā zài yě méi xiāngxìn rénmen