we bought this house last year they said i don't have a computer Nga said the group is working on their ptoject now Mike said Hoa is reading about ISSAC NEWTON today the teacher said

Here are the corrected sentences: 1. We bought this house last year, they said. 2. "I don't have a computer," Nga said. 3. "The group is working on their project now," Mike said. 4. "Hoa is reading about Isaac Newton today," the teacher said. Note: I added quotation marks to indicate the spoken words, and I capitalized "Isaac Newton" because it's a proper noun (the name of a person).