Проверьте правильно ли написала скажу сразу, что писала сама без словаря и переводчика. at the sunday we went to museum with our teacher. in middle of the museum stood a big dino's skeleton. when we came museum, teacher warned us. but we didn't hear her and broke a skeleton. before this, a teacher blamed us

On the sunday a big skeleton of dinosaur stood in middle of museum (обрати, внимание на прямой порядок слов в языке) лучше сказать: wnen we entered the museum, the teacher  warned us not to touch the exhibits (почитай про правильноеупотребление артиклей) therefore, the teacher blamed us ( "before this" означает "перед этим")

Есть некоторые не точности !   im middle of museum stood a big dino's skeleton. было бы точнее и проще написать :   and we broke the statue.  before this, a teacher blamed us. тут тоже не понятность . напиши так :   and the teacher scolded us! удачной учёбы ; 3

Iwant to tell you about the house of my dream.i  dream to live in a big and comfortable house.the house of my dream to be in the сentre of my beloved city."my house - my castle" - we hear from childhood.i will have an one-storey house.there will be a kitchen, a bathroom, а  nursery,a living-room, a sitting-room and  bedroom.in this house, i will live with my friendly family.we will have a beautiful garden.in the nursery should be a lot of   fun toys, bookcase, table for education and children's bed. in the bedroom - one large bed, mirror аnd  wardrobe.i want my kitchen to have all necessary modern equipment such as stove, refrigerator, mixer.in the living-room of the house of my dream there will be a sofa, two armchairs, tv-set and a stereo-system.  lots of beautiful plants and flowers will decorate the lawn in front of the house and many useful fruit-trees will grow an orchard behind it.i will have a lot of  flowers in pots.i believe that in the future i will live in that house