Найти инфинитивный оборот, выделить его, определить какой это инфинитивный оборот, перевести предложение на русский язык
It’s time for the children to go to bed. I’m sorry I didn’t hear the bell ring. Yuri Gagarin is known to have been the first cosmonaut in the world. He is said to be writing a new novel. She has closed the windows for you not to catch cold. I heard the door open and saw a man enter the room. Mother wants you to prepare dinner today. Is it difficult for you to get up earlier? She is said to work in the north as a doctor. I told you not to drink cold water.

Early diagnosis of postural disorders in children are the basis for successful correction. No less important, objective control on the therapy over the course of the disease in patients with more severe deformities of the spine. Classic for orthopedics diagnostic methods informative and have important diagnostic value, but their application is limited to medical indications.
Known methods of medical imaging based on photo and video, such as: "KOMOT" (Russia), "Optronic Torsograph" (Sweden), "Quantec" (England), "DIERS formetric 4D (Germany) and a number of other require expensive equipment and special conditions for the survey. This, in turn, limits their mass use.
Meanwhile, for the practical work of orthopedist, this kind of medical imaging and documenting the results of the survey is of great practical interest.
KEYWORDS: scoliosis, kyphosis, diagnosis, digital photo, universal software.
INTRODUCTION
Today, modern mobile devices (smartphones, tablet PCs, action cameras and other portable video registering the device) equipped with high-quality cameras with high resolution. The digital image obtained by such a device enables multi-component analysis [1] and measurement [2]. The reliability and accuracy of the indicators to a large extent depends on special software. There are a number of software products, mainly used to improve the image quality and measurements of the relative sizes of objects. An example of such software products can be iPhotoMeasure [3], MB-Ruler [4], Marker Meter [5]. While these programs are not without some disadvantages precluding their use in medical practice. Most of these software products are focused on measuring inanimate objects.
We have developed a test version of the software that allows for the analysis of the surface of the human body from the measurement of the main anthropometric parameters for digital image obtained using everyday mobile technology (the principle of "always at hand"). Such analysis and diagnosis based on it available, safe, informative and complement the clinical examination of the patient objective documented visualization.

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Past Simple употребляется для обозначения действия, которое произошло в определенное время в и время совершения которого уже истекло.
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2 группы глаголов
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Правильные глаголы и неправильные глаголы.
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формула образования Past Simple Tense правильных глаголов - V + -ed (глагол+окончание -ed)
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to visit-visited, to want-wanted.
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Формы Past Simple неправильных глаголов нужно знать наизусть.
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to see-saw, to come-came, to say-said, to do-did.
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Глагол to do может быть и смысловым (делать), и вс
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Глагол to do в времени -  did. Перед подлежащим.
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В начальной форме.
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Перед смысловым глаголом.
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Между вс глаголом did и смысловым глаголом (He did not go to school yesterday)
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Past Simple Tense можно узнать по этим словам в предложении - yesterday, always, often, last year и т.д.