Question

Помогите!!!!!!! Очень срочно прошу Вас, пожалуйста много баллов

Answer 1

• The second sentence doesn't make sense without the relative clause.
• In the third sentence the relative clause is used to give additional information.
• In the second sentence "which" could be replaced by "that".
• In the third sentence the information is extra and the sentence is clear without it, that is why we put a comma before the relative pronoun.