is
vt.& vi. 是(be的三单形式)
Is is the third person singular of the present tense of be .Is is often added to other words and shortened to -'s .
It is possible to cure psoriasis.
牛皮癣是可以治好的.
Russian spelling is phonetic.
俄语的拼法是音形一致的.
She is always worrying about little things.
她老是为小事烦恼.
This room is insulated against noise.
这个房间隔音.
A lie which is half a truth is ever the blackest of lies.
真假参半的谎言最险恶.