Which sentences are incorrect (неверные)?

Варианты ответов и условие задания

1. The girl wearing a beautiful dress.
2. The schoolchildren are not wearing their smart school uniforms at the moment.
3. You wearing a school uniform.
4. It's a special day today and the boys wearing white shirts.
5. All the pupils in our school are wearing their school uniform.
6. I am going to a PE lesson today, so I am wearing a sports uniform.
7. Mary is wearing a school pinafore.