Пожалуйста, помогите перевести предложения на английский.

Лучше переводить не через переводчик, т. к. переводчик переводит дословно, без контекста.

1. Why do you walk so fast? I walk fast because I'm freeaing. I never walk fast in summer.
2. Maria stays in the hotel.
3. My brother never wears hat in summer.
4. That evening at five o'clock I was watching TV
5. The postman usually comes at eight pm. It's eight thirty now and he hasn't come yet.

1. Почему вы идете так быстро? Я иду быстро, потому что я замерз. Я никогда не хожу быстро летом.
Why are you walking so fast//quickly? (Present Continuous Tense)- I'm walking fast, (Present Continuous Tense)because i"m cold. I never walk quickly in summer. (Present Simple Tense)

2. Мария останется в гостинице.
Mary will stay in//at the hotel. - простая констатация факта (Future Simple Tense)
Mary will be staying at the hotel.- запланированное действие (Future Continuous Tense)

3. Мой брат никогда не носит шляпу летом.
My brother never wears a hat in summer.(Present Simple Tense)

4. В тот вечер в пять часов я смотрел телевизор.
I was watching TV at 5 o'clock that evening. (Past Continuous Tense)

5. Почтальон обычно приходит в восемь часов вечера. Сейчас уже половина девятого, а он все еще не пришел.
The postman usually comes at 8 p.m. (Present Simple Tense) It's half past eight already, but he hasn't come yet.(Present Perfect Tense)

исправим немного грамматику и лексику предыдущего ответа:

1. Why are you walking/moving so fast? I am walking/moving fast because I'm frozen. I never walk fast in summer.
2. Maria stays in hotel.
3. My brother never wears a hat in summer.
4. That evening at five o'clock I was watching TV.
5. The postman usually comes at eight o'clock in the evening. It's half past eight already, and he has not come yet.

1. Why you are walking so quickly? I am walking quickly because I am chilled. I never walk quickly in the summer.
2. Maria will remain at hotel.
3. My brother never wears a hat in the summer.
4. I was watching TV at five o'clock of that evening.
5. The postman usually comes at eight o'clock in the evening. There is already eight and half, and he has not been coming yet.

http://www.translate.ru/ очень удобная ссылка для перевода проктически любые языки поддерживает !!!1. Why you go so quickly? I go quickly because I have frozen. I never go quickly in the summer.
2. Maria remains in hotel.
3. My brother never wears a hat in the summer.
4. That evening at five o'clock I watched TV.
5. The postman usually comes to eight o'clock in the evening. Already half ninth, and it still has not come.

В интуитивном переводе.
-What are you rushing for?
-It`s cold out here. Hadn`t it been winter, I wouldn`t rush.

-Maria is up to stay at hotel.

-Never in summer, my brother will put on a hat.

-On that day at 5 I`d been watching TV.

-Mr Postman hasn`t yet arrived though he used to come at 8 in the evening. And now is eight thirty.

Why you walk so fast? I'm walking fast because I'm cold. I never walk fast in Summer.
Marie stay in the hotel.
My brother never have a hat in Summer.
Postman usually came at eight o'clock. In this moment we have eight thirty, but he till now isn't came.