Udvidet tid/simpel tid

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Paul needed advice and money all the time. Therefore he often went to see his elder brother. The latter had just moved into a friend's house where he was staying now. Paul's new car drew up outside the house, and he got out when he thought he heard a strange sound from the engine. For a moment he was standing listening to the pavement. He wondered if he had stopped outside the right house. Outside the house next door a man was mowing his lawn while his son was mending the roof. Paul talked - was talking to the man when the door suddenly was being opened - opened. His brother had heard his voice, and now he was asking - asked him to come right in. A nice smell came from the kitchen where his wife was cooking dinner.
 

Okay, tak.
Hvad er grunden til, at de skal ændres? Jeg kan nemlig ikke selv se det ud fra de regler, jeg har fået opstillet.

I sætningen: "Paul was talking to the man when the door suddenly opened" skal to talk være i udvidet tid, da der sker et forløb, som imidlertidig bliver afbrudt af dørens pludselige åben. Et eksempel her kunne også være: I was reading the paper when John suddenly came in.

Den anden: "His brother had heard his voice, and now he was asking/asked him to come right in". Er jeg faktisk lidt i tvivl omkring, da ordet now har sin optræden i sætningen, hvorfor man normalt ville benytte sig af -ing formen.