7. Where you (to be) yesterday? — I (to be) at home the whole day. — How strange. I (to ring) you up at two o'clock, but nobody (to answer). — Oh, I (to be) in the garden. I (to read) your book and (not to hear) the telephone. 8. What you (to do) at five o'clock yesterday? — I (to work) in the library. — I (to be) there, too, but I (not to see) you. 9. Yesterday I (to work) at my English from five till seven. 10. It (to rain) the whole day yesterday. 11. Where your sister (to be) now? — She (to be) in her room. She (to do) her homework.

7. Where were you yesterday? — I was at home the whole day. — How strange. I rang you up at two o'clock, but nobody answered. — Oh, I was in the garden. I was reading your book and didn't hear the telephone.

Explanation:
In this dialogue, the first question asks where the person was yesterday. The answer given is "I was at home the whole day." The response to that is "How strange. I rang you up at two o'clock, but nobody answered." The person then explains that they were in the garden reading a book and didn't hear the telephone.

Step-by-step solution:
- The first question asks about the location or place where the person was yesterday.
- The answer to the question "Where were you yesterday?" is "I was at home the whole day." This sentence uses the past tense of the verb "to be" (was/were) and the adverb "whole" to indicate the entire duration of the day.
- The second part of the dialogue refers to a phone call at two o'clock and the lack of response.
- The sentence "I rang you up at two o'clock, but nobody answered" uses the past tense of the verb "to ring" (rang) and "to answer" (answered) to describe the actions.
- The person then explains the reason for not answering the phone. "Oh, I was in the garden. I was reading your book and didn't hear the telephone." This sentence uses the past tense of the verb "to be" (was/were), "to read" (reading), and "to hear" (didn't hear) to describe the actions and their consequences.

8. What were you doing at five o'clock yesterday? — I was working in the library. — I was there, too, but I didn't see you.

Explanation:
In this dialogue, the first question asks about the person's activity at five o'clock yesterday. The person responds by saying "I was working in the library." The other person then mentions that they were also in the library but didn't see the person.

Step-by-step solution:
- The first question asks about the person's activity at five o'clock yesterday.
- The answer to the question "What were you doing at five o'clock yesterday?" is "I was working in the library." This sentence uses the past continuous tense of the verb "to work" (was working) to describe the ongoing action at that specific time.
- The second person then mentions that they were also in the library but didn't see the person. The sentence "I was there, too, but I didn't see you" uses the past tense of the verb "to be" (was), "to see" (didn't see), and the adverb "too" to indicate that both people were in the same location but didn't cross paths.

9. Yesterday I worked on my English from five till seven.

Explanation:
In this sentence, the person states that they worked on their English from five o'clock until seven o'clock yesterday.

Step-by-step solution:
- The sentence states "Yesterday I worked on my English." This sentence uses the past tense of the verb "to work" (worked) to describe the action.
- It also specifies the time frame by saying "from five till seven." This indicates that the person worked on their English between the hours of five o'clock and seven o'clock.

10. It rained the whole day yesterday.

Explanation:
In this sentence, the person states that it rained throughout the entire day yesterday.

Step-by-step solution:
- The sentence states "It rained the whole day yesterday." This sentence uses the past tense of the verb "to rain" (rained) to describe the weather condition.
- The phrase "the whole day" emphasizes the duration, indicating that the rain persisted throughout the entire day.

11. Where is your sister now? — She is in her room. She is doing her homework.

Explanation:
In this dialogue, the first question asks about the current location of the person's sister. The answer given is "She is in her room." The second question asks about her current activity, to which the response is "She is doing her homework."

Step-by-step solution:
- The first question asks about the current location of the person's sister, using the present tense. "Where is your sister now?"
- The response to the question "Where is your sister now?" is "She is in her room." This sentence uses the present tense of the verb "to be" (is) to describe the current location.
- The second question asks about her current activity, using the present tense. "What is she doing?"
- The response to the question "What is she doing?" is "She is doing her homework." This sentence uses the present tense of the verb "to do" (is doing) to describe the ongoing action of completing homework.