我发现他每天很早起床用英语怎么说

楼上的都是错的。
首先find如果用过去时的话是found而不是finded,get的过去时是got,如果你前面用found，后面也应用got.
正确的说法是i find that(一般省略）he gets very early every day.主要表现的是一种一直持续的状态，所以用一般现在时比较好。因此完整的就是i find he gets up very early every day.

I founed (that) he get up very early everyday.
这是一个宾语从句，“他”在宾语从句中做主语所以我觉得必须用he 。

I finded (that)him gets up very early everyday.

i find he gets up early every day

I found him get up early every day.