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IV. Put the predicates info Past:
1. The infant must move as much as possible for the proper development of the body. 2. In this patient the proper functions of the heart can be impaired due to the grippe. 3. During work one must give rest to the organism (particularly to the brain and the eyes) every hour or half an hour. 4. His constant tiredness may impair his heart.

1. The infant had to move as much as possible for the proper development of the body.

2. In this patient the proper functions of the heart could be impaired due to the grippe.

3. During work one had to give rest to the organism (particularly to the brain and the eyes) every hour or half an hour.

4. His constant tiredness might impair his heart.