Chinese languages

i want to speak english well, my pronounce is poor so i think if you want to learn chinese and we can improve each other if you are interested in it, you can QQ me. QQ is the most popular IM in china and every use it. if you dont find QQ, you can email me to 1515368048@qq.com, and i will send this p...

they are same.

是 is high frequency than 乃是
and 乃是 always appear in old china not in modern