Grammatiske fejl

Jeg skal finde fejlen i de her følgende sætninger, og dernæst forklare hvori fejlen består. Men jeg kan ikke finde dem. Er der nogen der kan se hvor fejlene ligger? Jeg har prøvet at give min egen ide på nogle af dem...

1. Since he during a very long period of time had not slept well he went to see the doctor.

 - Since he, during a very long period of time, had not slept well, he went to see the doctor. (Her er det manglende komma der er fejlen.)

2. She is the writer who the paper reviewed last week

- She is the writer whom the paper reviewed last week. (Det hedder whom og ikke who)

3. I simply adore the works of shakespeare, which is always exciting.

- I simply adore the works of shakespeare, which are always exciting. (Works er flertal, derfor skal der stå are)

4. Because I could not stop for Death stopped he for me.

- Jeg kan simpelthen ikke finde hoved og hale i den her sætning...