Поставьте глаголы, данные в скобках, в соответствующем времени и переведите предложения

The two countries signed the treaty after the war had finished. 

Обе страны подписали уговор после окончания войны.

The treaty was signed after the war had finished by two countries. (Passive Voice).

Negative.

The two countries didnt sign the treaty after the war hadnt finished. 

The treaty wasnt signed after the war hadnt finished by two countries.

Interrogative.

Did the two countries sign the treaty after the war had finished? 

Was the treaty signed after the war had finished by two countries?