Перипишите следующие выражения в времени:1.it is already twenty minutes past eight.you must go or you will be late for the first lesson 2.i am very tired .i feel i mustgo to bed at once ,or i shall fall asleep where i am sitting .3. We can't wait for them any longer ,we must ring them uo and find out what has happened .4.i am thinking hard,,trying to find a solution of the problem .there must be a way out .5.it is quite clear to everybody in the family that he must start getting ready for his examination instead of wasting time .6. It is impossible to do anything in surh a short time. I must ask the chief to put off my report .7.i don't mean that you must do everything they tell you.

1. It was already twenty minutes past eight. You had to go or you would have been late for the first lesson.

Explanation: The original sentence is in present tense, but it refers to a time in the past. Therefore, we need to change the verb tense to past.

Step-by-step solution:
- Change "is" to "was" to reflect the past tense.
- Change "already" to "had" to indicate that the action had already happened before a specific point in the past.
- Change "must go" to "had to go" to show that it was necessary to go in the past.
- Change "will be" to "would have been" to express the potential consequence of being late in the past.

2. I was very tired. I felt I had to go to bed at once, or I would have fallen asleep where I was sitting.

Explanation: The original sentence is in present tense, but it refers to a past situation and a possible future consequence. Therefore, we need to change the verb tense to past and use the conditional form for the future consequence.

Step-by-step solution:
- Change "am" to "was" to reflect the past tense.
- Change "must go" to "had to go" to indicate that it was necessary to go in the past.
- Change "shall fall asleep" to "would have fallen asleep" to express the potential consequence of falling asleep in the past.

3. We couldn't wait for them any longer. We had to ring them up and find out what had happened.

Explanation: The original sentence is in present tense, but it refers to a past situation and action. Therefore, we need to change the verb tense to past.

Step-by-step solution:
- Change "can't" to "couldn't" to indicate the inability to wait in the past.
- Change "must ring" to "had to ring" to show the necessity of making a phone call in the past.
- Change "has happened" to "had happened" to reflect the past tense and the occurrence of the event before a specific point in the past.

4. I was thinking hard, trying to find a solution to the problem. There had to be a way out.

Explanation: The original sentence is in present tense, but it refers to a past situation and the belief in a possibility. Therefore, we need to change the verb tense to past.

Step-by-step solution:
- Change "am" to "was" to reflect the past tense.
- Change "must be" to "had to be" to express the necessity of finding a solution in the past.
- Maintain "thinking hard" as it is, as it already indicates the past action.

5. It was quite clear to everybody in the family that he had to start getting ready for his examination instead of wasting time.

Explanation: The original sentence is in present tense, but it refers to a past situation and the necessity of an action. Therefore, we need to change the verb tense to past.

Step-by-step solution:
- Change "is" to "was" to reflect the past tense.
- Change "must start" to "had to start" to indicate the necessity of starting in the past.

6. It was impossible to do anything in such a short time. I had to ask the chief to put off my report.

Explanation: The original sentence is in present tense, but it refers to a past situation and the necessity of an action. Therefore, we need to change the verb tense to past.

Step-by-step solution:
- Change "is" to "was" to reflect the past tense.
- Change "must ask" to "had to ask" to indicate the necessity of asking in the past.

7. I didn't mean that you had to do everything they told you.

Explanation: The original sentence is in present tense, but it refers to a past situation and the lack of necessity. Therefore, we need to change the verb tense to past and include the negative form.

Step-by-step solution:
- Change "don't mean" to "didn't mean" to reflect the past tense.
- Change "must do" to "had to do" to indicate the past necessity.
- Maintain "everything they tell you" as it is, as it already indicates past actions.