Help me learn to speak Susan's language

Question

Susan was born with an extreme case of the rare communication disorder, "dyscryptia", which has enthralled neuroscientists and computer scientists alike from all 6 corners of the globe. She is one of only a dozen recorded cases. This puzzling disorder is unique in that in each of the twelve cases, the disorder manifests itself in a distinct manner; the common denominator being that the disorder always affects communication letter by letter.

I met Susan just yesterday night at the local pizza parlor as she was playing a beautiful piece on the place's piano. I went up to her to compliment her playing, but of course, my message didn't get across. She pointed at a square board on top of the piano consisting of many common English words coupled with their translations, and I used it to repeat myself.

In the conversation that ensued, I found myself enchanted by this strange woman. I would like to prepare for the next time we meet, so that I may speak her language and offer a more comfortable conversation.

I remember a few useful details. Maybe my memories could serve as a Rosetta Stone, a bridge between our languages.

Susan referred to herself as "Nntog", and to her language as "Susubam". Following is a list of words and their translations that I can recall.

| Time | Good | Have | Give | Want | Take | Make | Know | Last | Long | Next | Come |
| Cvry | Vdsk | Iwam | Peal | Xohq | Ulpy | Nlpr | Yclh | Mtmf | Acus | Scrh | Rbrh |
-------------------------------------------------------------------------------------
| I | A | You | He | She | It | The | Of | On | And | But | Or | Right | Add | Near |
| I | A | Njt | Mm | Amx | Cc | Bmy | Uu | Cc | Ore | Wov | Gg | Apobl | Ehe | Sfsf |

There were more.. but I can only remember so much.

Oh, and as I was leaving, she told me, "Hgjqz cqjos njmh yizaj, cm'i hgqccnkb rapf am clp." She must have forgotten for a moment that I don't speak Susubam?

Answer 1

EDIT: Finally solved last part.

Decrypted Sentence:

Sorry about your pizza, it's probably cold by now.

Also, I got curios about previous sentence which was edited. In case anyone wondering it is decrypted as:

I have to get home. Maybe I'll see you next week.

ORIGINAL:

I solved the encrypting part, however decoding isnt that easy. Still working on that part but this is my partial answer.

Each letter has a value as following a=1,b=2,c=3...,y=25,z=26

Encryping works as following;

Assume word is A,B,C,D then ecrypted text is (A+B)%26, (B+C)%26, (C+D)%26,(D+A)%26

Lets try with examples:

Good = 7,15,15,4 = (7+15)%26,(15+15)%26,(15+4)%26,(4+7)%26 = 22,4,19,11 = Vdsk
Give = 7, 9, 22, 5 = 16, 5, 1, 12 = Peal
On = 15,14 = 3,3 = cc
Of = 15,6 = 21,21 = uu

Decrypting:

So all the words which have only 2 letters must encrpyt into a double letter word (such as aa,bb,cc..). However, Susan's last sentence has 2-letter word(am) which doesnt fit this rule.

If this is not a mistake, I'm assuming we should evaluate all words in a sentence together and probably gonna ignore signs('.).