Составьте предложения со словом must and mustn't

I must help my mom
Я должна( должен моей маме
I mastn't be not obedient. Я не должен ( не должна ) быть непослушной( ым )

смотри как тебе подходит : должен или должна ☺

I must leave. I mustn't eat this cake.

Death Valley Another black spot is located on the Kamchatka Peninsula. It's Death Valley, which rumored since the early 30-ies of the last century. there are hot springs on the slopes of the volcano Kikhpinych. Their thermal pad is quite small and are cut by ravines. At the bottom and on the slopes there are jet acidic hot water, gas and steam. The lowest area was called Death Valley. She was found the hunters who have lost a dog. Corpses huskies found at the foot of the volcano, and next to them on the bare, without a single blade of grass, the ground lay the dead animals - bears, wolves and hares. Surprisingly, after visiting this place hunters have become stunted in their eyes, they lost weight and suffered headaches. In the study of the Valley of death, killing more than 100 scientists and enthusiasts. But those who are able to return, did not share his observations. It turned out that at the site of a length of 2 km and a width of 300 meters there are hydrogen sulfide and carbon dioxide. A valley in the volcanic gases have toxic cyanide compounds.

Robert: Pat, may I introduce someone to you? This is Dasha, she wants to work with us for the RAP. Pat: Hello, Dasha. Nice to meet you. Dasha: Hello, Pat! Nice to meet you, too. Pat: What is your surname? Spell it, please. Dasha: Petrova. That`s P-E-T-R-O-V-A. Pat: Are you French? Dasha: No, I`m not. I`m Russian. Pat: Where are you from? Dasha: I`m from Moscow. Pat: How old are you? Dasha: I`m fourteen. Pat: Are you working now? Dasha: Yes, I am. I am working as a journalist for our school magazine. Вот :3