Note:（-）means delete the original character, while（吗） means increase the new Chineses character.
Please see the sentence as below.
你可（-）以把信（件）拿来（吗）? – can you go bring me the mail
你可以（去）拿（-）信（件）吗? - can you go get me (bring?) the mail
你带来（-）信（件了）吗? – did you bring the mail with you?
我（的）信带来了 / 我带来了信 –I’ve bought the mail with me