Задайте вопрос к подлежащему. Дайте ответ.
1.
-The children are cold.
-Вопрос
-The children ...
2.
The boys were hungry/
-Вопрос.
-The boys ...

Если самые простые вопросы, то:1.-The children are cold.-Who is cold?-The children are cold. / The children of Mr. Smith are cold.2. The boys were hungry.-Who was hungry?-The boys were hungry. / The children of Mr. Smith were cold.