Смотрела фильм на , девушка в нем заплакала, а её парень спросил: "why you cry? " почему здесь употреблено время в present simple, если действие происходит сейчас? я думаю, что нужно , люди!

Скорее всего это разговорный, потому что это даже не Present Simple, ибо в Present Simple вопрос должен быть построен с do: Why do you cry? Также я не знаю всей ситуации, если они 2 недели находятся на дрейфующем в море корабле с мертвым капитаном, будет уместно именно Present Simple(потому что девушка скорее всего часто плачет, а не в данную момент и парня интересует вообще почему она начала ныть).Но если девушка "кремень", и очень сильная, то будет уместно именно Present Countinuous, потому что парень удивлен что она плачет в данный момент.

Thanks a lot for your last letter. Sorry, i haven't writtel, becouse i was busy with my school.
In Your latter, you say me thet your parents can prize you a pet for birthday. Well, it's great! So, i think that dogs is wery preatty pets. The a so fiendly and beautifull. But the dog can be wery trouble. You must always wolk wit your pet. But cats a so lasy and i supose thet you will be bored with a cat. But never take the humster! they a wery smelly. Well, from my experience and observation i advice you to get a dog. becouse it will be wery funny. 
Well, I have to go now, becouse I must do my homework. Write back soon.
Best whishes.

1. По-моему, лучше будет так: "This is my last year at teachers training college". 2. As for my positive traits of character, I am kind, friendly, sociable, funny and emotional. 3. I like to help people in any situation. 4. If someone needs help and asks me, I give up all my business and come to help him. 5. I have many friends and I enjoy big parties very much. It's so funny! 6. Anyway, I also have some negative traits of character. To tell you the truth, I am very lazy. It's very hard for me to wake up early in the morning, for instance. 7. ... for example, a home-task on any subject, washing-up or the housework. 8. In my opinion, the most important traits of character are kindness and joy. 9. When you are kind and joyous, people are pleased to communicate with you and this creates a good atmosphere. 10. But sometimes people can use your kindness just to reach their own goals. 11. It happens when they know that you can't refuse and ask you for something.