Задать типы вопросов.1.the pupils are reading a book .2.the music is very beautiful.3.my mother came home at 8 p.m yesterday.

Weather is something we can talk about every day. In the place where I live it’s very changeable, so people always inquire what it is going to be like tomorrow. My city is situated in southern part of Russia and we have four seasons here: winter, spring, summer and autumn. My favourite one is summer because it’s hot then and I can swim in a nearby river. When the weather is fine I can also ride my bike. However, it’s not always hot here even in summer. As I’ve mentioned before, the weather is rather changeable here. It can bring sunshine and heat one day, rain and cold the next day. Autumn brings heavy rains and winds to our region. Honestly, I don’t like autumn. Starting from late October almost every day it’s muddy and gloomy outside. Winters are mild here. The first snow falls at the beginning of December. It quickly melts though. There are some really cold days in January and February. I like the days when the sun is shining but it’s frosty outside. My friends and I go sledding or snowballing on such days. Spring starts with sunshine and warm winds. When the snow melts away you can see the primroses make their way out of the ground. April and May are quite warm months. Birds start singing, trees start blooming, and there are lots of tulips and daffodils around. I hear my neighbors often discuss the weather. They usually say “A nice day, isn’t it?” or “It looks like rain”. They also ask each other about weather forecast. I think that weather is the most popular topic for conversation. I’ve heard that English people also like discussing the topic of weather.

The используется, когда говорящий говорит о каком-то конкретном предмете. Например, о ручке, лежащей на столе, которую он видит: The pen at the table.

A и an используются в противоположном случае, а именно, когда говорящий рассказывает не о конкретном предмете. Например, он говорит, что хочет купить машину: I'd like to buy a new car. 

По сути, a и an - это один и тот же артикль, только a используется перед существительным, начинающимся на согласную, а an перед существительным на гласную. Например, an apple, но a dog.