1. Each of us has something to do.

2. We each have something to do.
(Are both grammatical? in #1 we us 'has,' and 'in #2 we use 'have.')

3. All the books were expensive.
4. All the people were surprised.
5. All are old things.
6. All is old things.
7. All is over.
8. All is old.
(Among the 6 sentences, which ones are not grammatical?)