1. My mom disappointed becase = because I cheat = cheated in the test. (NOTE: Christine, be careful on your spelling. ;) And, for the verb "cheat" here, we are going to use the verb "cheated" [past tense] because the action is already done. ^^)
2. I think my friend sengen = Sengen was cheating = cheated on me at/during the test. (NOTE: Christine, always write the first letter of the names of people in a capital [big] letters. ^^)
3.oh-no! I send the message wrong not to my friend maryann, to teacher! I siad "oh my! the test is
tmarrow, Can I cheat you? = Oh no! I sent a wrong message to teacher Maryann. I said "Oh my! There's a test tomorrow. Can I cheat from you?