Simpel og udvidet tid Simpel og udvidet tid

Jeg har fået en en tekst, som der er fem fejl i, som har noget at gøre med simpel og udvidet tid. Jeg er ikke særlig god tid det, men har da prøvet så godt jeg kunne: (de steder, jeg tror der er fejl, er sat i parentes og nummeret)

While the small boy (1. walked) down the street he suddenly remembered what day it was: it was Friday and he was going to meet his father. He hurried to the corner where they always met, but his father (2. was not being) there yet. He sat down to wait. When he (3. had waited) for more than an hour he began to worry. His father might have forgotten what day it was, but he (4. was not really believing so). His father (5. was always remembering) everything.

1. Walked = was walking
2. Was not being = wasn't
3. Had waited = had been waiting
4. Was not really believing = didn't really believe
5. Was always remembering = did always remember

Jeg er ikke særlig god til simpel og udvidet tid og synes det er ret svært, så vil lige høre, om I mener, det jeg har gjort, er rigtigt?