Japanese language(what is the difference)?

Question:

between

te + kudasai
te + kudasaimasen
te + itadakemasen

Thanks

Answer:

I'd use/translate like:

te + kudasai
a. sore o motte-kite kudasai: Please bring it here.

te + kudasaimasen (usually accompanying "ka" )
b. sore o motte-kite kudasaimasen ka?: e.g. Would mind bringing it here?

te + itadakemasen (usually accompanying "ka")
c. sore o motte-kite itadakemasen ka?: e.g. Would you bring it here, please

I use c for the most polite way when I ask someone for a favour. (I rarely use b)