Нужна помощь с упражнениями по английскому, пожалуйста

1. Give the short answers to the questions below according to the pattern. 
Pattern: Is Kovalev present at the lesson? –Yes, he is. (No, he is not.)
1) Was it cold last winter?
2) Are your friend's sisters beautiful?
3) Is it hot today?
4) Is it Sunday today?
5) Were you free yesterday?
6) Are you twenty years old?
7) Will you be at home in the evening?
8) Are the trees green now?
9) Is your house in the centre of the city?
10) Will your mother be at home at five o'clock?

2. Explain the use of the verb to be in the sentences below and translate them into Russian.
1. They were at home last night.
2. He is a well known scientist.
3. They are to leave Moscow to-night.
4. The children were walking down the street.
5. She is an experienced teacher.
6. The letter will be posted at once.
7. He is in Kiev now.
8. We were to part that day.
9. The letter was written by the secretary.
10. They were to have arrived at seven o'clock.
11. The purpose of his visit was to negotiate for the purchase of timber.

3. Translate into English.
1. Ее нет здесь сейчас, она дома.
2. Его не было дома вчера вечером.
3. Он один из лучших врачей нашей больницы.
4. Его задача заключается в том, чтобы собрать материал по этому вопросу к 1 июня.
5. Он находится сейчас в Крыму.
6. Она будет там в пять часов.
7. Пароход должен придти в 6 часов вечера.
8. Его брат инженер.
9. Я должен был встретиться с ним в 8 часов вечера.
10. Он будет рад вас видеть.