определить функцию инфинитива в
следующих предложениях.

1 The sow is known to be placed in a farrowing pen two weeks
before she is to farrow. 2 To keep hogs on pasture is very
important. 3 To produce a large litter a gilt should not be bred
until she is 9 months old. 4 The sow to farrow should be washed
thoroughly. 5 The farmer wants his pigsty to be cleaned to-day. 6
The quantity of grain to be fed to the boars varies with his
condition. 7 Our first task is to increase the agricultural production

Every country and every nation has it's own traditions and customs. It's very important to know traditions and customs of different people. It will help you to know more about the history and life of different nations and countries.One cannot speak about England without speaking about it's traditions and customs .They are very important in the life of English people.Englishmen are proud of their traditions and carefully keep them up. There are six public holidays a year in G.B.. Cristmas day is one of their favorite holidays. It's celebrated on the 25th of December. There are some traditions connected with it. One of them is to give presents to each other. It is not only children and members of family. It's a tradition to give cristmas presents to the people you work with. Another tradition is to send cristmas cards. All these cards are brightly and coloured. Most of big cities of G.B., especially London, are decorated with coloured lights and cristmas trees. On Trafalgar Square, in the center of London stands a big cristmas tree. It is a gift from the people of Oslo. It is over 50 feet high. Many families celebrate cristmas day in the open air near the cristmas tree in order to catch the spirit of cristmas. Children find cristmas presents in their stockings. The traditional english dinner on cristmas is turkey and pudding. Other great holidays are: Father's day, Mother's day, Halloween and other.

Настоящее простое – agree, changes, buys
Настоящем продолжительное - is changing
простое – developed, started, could be called, created, appeared, decided, sold, became
совершённое -
продолжитльное - was spreading, was playing
Настоящее совершённое - has spread

The popularity of western music has spread (Present Perfect) all over the world. Pop music developed (Past Simple) into a global industry in the second half of the 20th century. It started (Past Simple) with Elvis Presley and the Beatles, who could be called (Past Simple Passive) the word's first rock stars. These musicians created (Past Simple) a new era, allowing other singers to become internationally famous.
Rock'n'roll was spreading (Past Continuous) throughout the continents when a small group in the north-west of England appeared (Past Simple). At that time, the group was playing (Past Continuous) in small halls in Liverpool. They decided (Past Simple) to change their name from the Quarrymen to the Beatles and in the following eight years, they sold (Past Simple) millions of copies all over the world and became (Past Simple) as popular as Elvis.
Both music professionals and fans agree (Present Simple) that Elvis Presley and the Beatles are the most valuable phenomena (Present Simple) to have entered the pop music world of the 20th century. They started (Past Simple) a new era that then created (Past Simple) a new global industry.
But pop music changes (Present Simple) quickly. It is sometimes difficult to understand (Present Simple) why a group or a singer is successful (Present Simple) and why the public buys (Present Simple) their music. For this reason, the industry is constantly changing (Present Continuous).