Which of these sentences are grammatically incorrect? Correct the mistakes.
- I paid the waiter and left.
- I told them not to worry.
- I wish I can go with you to the concert!
- The police are investigating the matter.
- The cake was perfectly.
- I need to work in my phrasal verbs.
- What we were talking about?
3. I wish I could go with you to the concert!
5. The cake was perfect.
6. I need to work on my phrasal verbs.
7. What were we talking about?