Now it is (lost).这句话对吗?

问题描述:

Now it is (lost).这句话对吗?
不对的话怎么填?Now it is ( ).He can't find it
是no lesson还是no lessons?

一般都用it's gone我们上课就学了lose lost那就填lost,语法上没错误,只是没那么地道。no lesson与no lessons都可以,no后跟单复数都对