The structure 再...也...
We use this structure to construct sentences like “no matter how…,still…”, “even if”.
The structure 再…也… 
expresses that even in extreme conditions, an action will still happen in a certain way.
There are usually two subjects in such sentences. The first should be stated before 再 and the second should be stated before 也.
expresses that even in extreme conditions, an action will still happen in a certain way.
There are usually two subjects in such sentences. The first should be stated before 再 and the second should be stated before 也.Scheme
subject 1
再
predicate 1
adjective
subject 2
也
predicate 2
verb
Pay attention
After 也, we often use a modal verb such as 要 or 会 .
or 会 .Examples
天气再冷，我也要去上课
No matter how cold it is, I still have to go to school
tiānqì zài lěng, wǒ yě yào qù shàngkè
这个语法再难，我也要明白
I have to understand this grammar even if it is difficult
zhè ge yǔfǎ zài nán, wǒ yě yào míngbái
To make a negation, the negative particle should be stated after 也. Then the structure has the opposite meaning: no matter the situation, something will never be done or happen again.
Examples
这部手机再便宜我也不买，因为我已经有一部了
I won't buy this phone even if it's cheap, because I already have one
zhè bù shǒujī zài piányi wǒ yě bù mǎi, yīnwèi wǒ yǐjīng yǒu yí bù le
Usually 再 is stated after the subject and before the predicate. However there are also other cases that are possible. For example, when we use 再 as a part of the state complement:
Examples
你说得再好听，我们也不相信
No matter how convincing you state it, we won't believe it
nǐ shuō de zài hǎotīng, wǒmen yě bù xiāngxìn