The pattern A是A，B是B
The pattern A是A，B是B 
emphasizes the difference between the two concepts.
For example, “me is me and you are you”.
emphasizes the difference between the two concepts.
For example, “me is me and you are you”. Pay attention
This pattern is used in spoken language.
Examples
朋友是朋友，女友是女友，你应该分得清楚吧
A friend is a friend, and a girlfriend is a girlfriend. You should be able to distinguish it
péngyou shì péngyou, nǚpéngyou shì nǚpéngyou, nǐ yīnggāi fēn de qīngchu ba
去年是去年，今年是今年，情况已经变了
Last year is last year, and this year is this year. The situation has changed
qùnián shì qùnián, jīnnián shì jīnnián, qíngkuàng yǐjīng biàn le
想是想，做是做，结果完全不一样
Thinking is thinking, and doing is doing. They end up with completely different results
xiǎng shì xiǎng, zuò shì zuò, jiéguǒ wánquán bù yíyàng
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