его...their их
that(нет множественного числа) -этот
their (нет мн.ч так как это и так множественное число)
houses- дома
yard home kittens(это уже множественное число)-котята
1)Yes,it's dull film I have ever seen
2)Yes,its clever pet I have ever had
3)Yes,he is industrious person I have ever met
4)Yes,they are responsible people I have known
5)Yes,it is an interesting newspaper I have ever read
6)Yes,it is a difficult text I have ever translated
Andy and Carol <u>are</u> pupils. <em>(множественное число)</em>
I <u>am</u> from Kazakhstan. <em>(I - Я, поэтому глагол to be → am)</em>
His sister <u>is</u> a doctor. <u><em>(</em></u><em>His sister - Его сестра = она, поэтому глагол to be → is)</em>
А что надо именно сделать до писать или перевести ?
<span><span> </span>1. If I knew the result now, I would phone her immediately.
2. If I were you, I would stay at home.
3. If you had not missed the train, you would have arrived in time.
4. If they had known it before, they would have taken measures.
5. Your brother would become much stronger if he took cold baths regularly.
6. If he were a first-class sportsman now, he had not been training enough last year. Здесь они намудрили. Условие не может быть в настоящем, а следствие в прошедшем. Время не идёт в обратном направлении.
<span>7. If I had written the composition yesterday, I would be free now.</span></span> Mixed conditional, а не 2 или 3 типа.