Explain Krashen’s Monitor Model (five hypothesis)

I think that this is too large a request, Xiaowangshu. I think that it would be better for you to read at the link below, about Krashen's Monitor Model,

http://en.wikipedia.org/wiki/Monitor_hypothesis

and then ask questions about areas that you don't understand.

I think these "homework" tags are not very helpful at all.

Really, who cares if someone is helping another with their homework. That's the point of homework, to research on one's own to more fully understand the issue/subject at hand. If someone here has the ability to raise the level of understanding for any student on any subject, that is nothing but a good thing.

thank you very much