Note:(-)means delete the original character, while(吗) means increase the new Chineses character.
Please see the sentence as below.
这些句子(-)对不对?
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