Письмо другу который болеет болезнью have a headache have a stomachache have an earache have a sore throat have sore eyes have a high fever have a toothache feel exhausted

Если я правильно поняла, то нужно выбрать одну из болезней? Если нет, могу обо всех написать потом. Сейчас пока только одну.

Hi, David.
I heard, that you feels awful, because you have a stomachache. I think, it can be poisoning. But what it can be? You felt bad yourself after we had a pizza in cafe yesterday. I am very worried about you. You have to be treated. 
With best wishes, your friend.

I can speak English. My father can not speak German. Can you speak French? My sister can not skating. Can you swim across this river? I can't drink this milk. She can't understand you. Could you swim last year? Last year I could not skiing, but now I can. Could you tell me how to get to railway station? Could you help me? I can't translate this sentence. Where can I buy bread here? Could your grandmother dance when she was young? Yes, she could and she can now.

Will you be able to do this work tomorrow? I think, she won't be able to make this task. Tomorrow I will be free and be able to help you. Will we be able to go to New York next year? Will you be able to fix my tape recorder?  Yesterday I could not see the director , because he was at the conference, but today after work I will be able to.

1.I can speak English. 2.My father can't speak German. 3.Can you speak French? 4.My sister can't skate. 5.Can you swim across this river? 6. I can't drink this milk. 7.She can't understand you . 8.Could you swim last year? 9.Last year I couldn't ski but now I can . 10.Can you tell me how to get to the station? 11.Can you help me ? 12.I can't translate this sentence. 13.Nobody could help me . 14.Where can I buy some bread? 15.Could your grandma dance when she was young? - Yes , she could. She can dance now too .