Meaning of méi shì r:
没事儿
to have spare time
Wǒ jīntiān xiàwǔ méi shìr, kěyǐ bāng nǐ.
我今天下午没事儿,可以帮你。
I have spare time this afternoon, so I can help you.
free from work; it's not important; it's nothing; never mind
Wǒmen míngtiān xiàwǔ dōu méi shìr, kěyǐ yīqǐ qù kàn diànyǐng.
我们明天下午都没事儿,可以一起去看电影。
We are all free tomorrow afternoon, so we can go watch a movie together.
Bié dānxīn, nà zhǐ shì yīdiǎn xiǎo wèntí, méi shìr.
别担心,那只是一点小问题,没事儿。
Don't worry, it's just a small problem, it's not important.
Bié dānxīn, méi shì r.
别担心,没事儿。
Don't worry, it's nothing.
Tā wàng le dài shū, dàn wǒ gàosu tā méi shì r.
他忘了带书,但我告诉他:没事儿。
He forgot to bring the book, but I told him never mind.