обьясните почему глаголы пишутся именно в этой форме.

Since ancient times people have dreamt of flying in the sky.
At first people flew in a balloon, and it was great victory. In
small and could not fly very far. Nowadays the engineers
make very big planes. They can fly a long way and carry
passengers from one city to another and from one country to
another. And it does not take them much time. Travelling
England, for example, lasts for three hours and a half
you
can reach the USA in ten hours.
People who travel by plane arrive at the airport. A traveler has
to come two hours earlier to the airport if he does not want to
miss the plane, and to get everything ready on time.
​

I тип условно- придаточных предложений:

1. If I do my homework I'll go for a walk with my friends.

2. If she doesn't cook dinner, her children will be hungry.

3. When they write the dictation they will have a rest.

4. If I finish my school year excellently my parents will give me a present.

5. If the sun shines he will not take the umbrella.

II тип условно- придаточных предложений:

1. If I didn't read this book my techer would give me a bad mark.

2. If he came to see me I would show him my collection of coins.

3. If they came in time they would not miss the train.

4. If the weather was fine I would go to the beach.

5. If I were you I wouldn't do that.

I HAVE A FRIEND. hER NAME IS aNN. She is  14. Ann is a nice girl  with green eyes and long fair hair. Her face is delicate and beautiful. She is not tall. Very often people think that we are sisters because she looks like me. She  goes to the same school where I do.nn studies very well and always helps me with my homework. Her favourite subject is English. She spends a lot of time learning new words and reading English books. Besides she is fond of music. She  can play piano very well/ Last year she won the music competition where she played Mozart better than all other pupils.I admire the  way  she plays. I can*t imagine  my life without Ann. She is a true friend whom I can tell everything  and she can always  help me when I need it.