一道八年级英语题I find physics very difficult.physics和very之间可以填一个is吗

可以.
1.I find physics very difficult.
这是“感官动词find + 宾语physics + 宾语补足语very difficult”结构.
2.I find physics is very difficult.
= I find (that) physics is very difficult.
这就变成了find后面加一个以被省略的that为引导词的宾语从句了.
宾语从句中,physics是主语,is就是系动词,very difficult为表语.