Grammar Defining vs. non-defining relative clauses Choose the correct word to complete the rule. RULE: Non-defining relative clauses give extra information, after a comma or between commas: John's brother, who is a doctor, lives in London. John probably has only one / more than one brother. Defining relative clauses tell us which person, place, or thing we mean. Who or that can be used to talk about people. There are no commas: John's brother who is a doctor lives in London. John probably has only one / more than one brother. That is usually used instead of which in defining relative clauses.

Решение:

В правиле нужно выбрать правильный вариант для заполнения пропусков, чтобы оно соответствовало определению определяющих и неопределяющих придаточных предложений.

Правильный вариант:

RULE: Non-defining relative clauses give extra information, after a comma or between commas:

John's brother, who is a doctor, lives in London.

John probably has only one brother.

Defining relative clauses tell us which person, place, or thing we mean. Who or that can be used to talk about people. There are no commas:

John's brother who is a doctor lives in London.

John probably has only one / more than one brother.

That is usually used instead of which in defining relative clauses.

Обоснование:

• В первом случае, если у Джона один брат, это дополнительная информация (неопределяющее придаточное).
• Во втором случае, если у Джона один брат, это определяет, о ком идет речь (определяющее придаточное).

Ответ: one.