Read the sentences, then identify the mistake and correct it?

Read the sentences, then identify the mistake and correct it. 1. Lucy is do her English homework in the living room. Doing playing staying 2. My friends Monica and John is working in the office right now. Is am are 3. My colleague Santiago are eating lunch in the factory now. Am is are 4. My friend Sandy taking music classes. Is are am 5. Your student Karla is play in the classroom. Playing plays play 6. Erika is swims in the pool every Wednesday. Swimming swim driving 7. Their daughter is studing Math in the classroom. Washing chasing studying 8. My neighbors are play a musical instrument. Eating playing sleeping 9. Michael are reading a magazine in this moment. Am are not is 10. My cousins is singing a beautiful song. Are sing am.