Bonsoir
a- The informer was smoking outside the building but he didn't say hello to Jack Reaper.
b- Julia hated her boss Brian so maybe she killed him.
c- Jack's wife was waiting for him.
d- The neighbour was chatting on the phone with his friend Julia.
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simple past > pour des actions passées terminées et courtes ou habituelles.
past be Ving > pour des actions passées qui étaient en cours
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Bonne fin de soirée☺☺☺