表"因为",引导原因从句可以怎么用?有什么差异?

since， 既然，因为。例如：Since you are ill, you can stay at home.
as ，因为,由于。例如：As it is big and red, we all like it.
for,因为，表示因果的关系不强烈。例如：He didn't present the meeting, for the plate is far from his home.
for the sake of为了。例如：We fight for the sake of our homeland.

as
for