Задайте вопросы к подлежащему. 1.They were at school yesterday. 2.They were thirsty but they didn`t drink any water because it was dirty. 3. The sailor did not discover any islands. 4.She couldn`t speak English last year.

1.  Who was  at school yesterday?

2.  Who was thirsty but didn`t drink any water because it was dirty?

3.  Who did not discover any islands?

4.  Who couldn`t speak English last year?

1.  Who was at school yesterday? - вопросительное слово "who" в вопросе к подлежащему всегда ед. число, поэтому was

2.  Who was thirsty but didn`t drink any water because it was dirty? - вопросительное слово "who" в вопросе к подлежащему всегда ед. число, поэтому was

3.  Who did not discover any islands? - отрицательные вопрос, поэтому didn't

4.  Who couldn`t speak English last year? - без особых правил