Exercise 3. Look again at the experiences in Exercise 1. Write down what youhave or haven’t done in your life. Use Present Perfect Tense - S+have/has+verb(ed)/past participles(verb 3) For example: I have climbed a mountain. I have never climbed a mountain. I have ridden a camel. I have never ridden a camel.

I have written a poem. I have lost money. I have never done bungee jumping. I have slept in a tent. I have never driven a tractor. I have never climbed a mountain. I have never sung in a karaoke club. I have never ridden a camel.

About  one hundred years ago it took a lot of time to travel from one town to the other. Sometimes it took weeks to get from one country to the other.The trip itself was dangerous and tiresome. As time passed everything changed.
Nowadays you can reach the other side of the planet  just in some hours. Now there is a wide choice of means of transport. You can travel by land, by sea,  by air. Of course the fastest way of travelling is by plane. It will take you only about six - nine hours to get to the USA, which is situated very far from our country!
Travelling by train or by car  is slower, than by plane, but you can enjoy picturesque landscapes during the trip.
Most people think that travelling is one of the most splendid things in the world.Travellig  gives us life experience. It broadens our mind and allows us to understand other people better, to see other countries and different sights, to taste unusual  and exotic food, improve some foreign language, meet new  people, make new friends,  take interesting photos and selfi . I like visiting new places, museums, churches, monuments and other sights.Travelling is useful and it's fun.

Существует легенда-теория, что артикль а появился на свет или, правильнее сказать, редуцировался из слова one (один), поэтому сегодня этот артикль ставится только перед существительными в единственном числе.

A book – книга, a dog – собака

Однако если слово начинается с гласной, к а добавляется n. Например, an egg (яйцо). Это явление есть и в русском языке, к примеру: о доме, но об окне.

Что касается артикля the, то он универсален, его можно ставить перед существительными как в единственном, так и во множественном числах.
А is ставится во времени Present Countinious с местоимениями he, she, it. Но ещё и в будущем времени( раз ты во 2-ом классе то это не обязательно)