我想知道 Be strict in/with 的用法

e strict in ,in 后加事物
如：We should be strict in (doing) our work.
对工作我们应该严格要求.
而be strict with,with 后 加人
如；His father is strict with him
他父亲对他严格要求.
be made of 是可以看得出原料的.例如
The desk is made of wood.
而be made from.是不可以看出原料的.例如
Paper is made from wood.