Они занимались упаковкой чемоданов

Они занимались упаковкой чемоданов всю ночь и к утру были абсолютно измучены.

Результаты (английский) 1:

They were engaged in packing suitcases through the night and by morning were absolutely frazzled.

Результаты (английский) 2:

They were engaged in packing suitcases all night and by morning were absolutely exhausted.

Результаты (английский) 3:

they were packing suitcases all night and in the morning had been completely exhausted.