I'm not sure I understand what you say because I do not speak English. Very little time to learn English From work I'm very tired I teach students with seriousness.
I'm not sure What to say The doctor will understand because I can't speak English is very little time to learn English. Return from work. I am very tired because I teach students with serious.
I'm not sure what the doctor said would understand because I did not speak English as a time to learn English very little return from the work I was very tired because I am teaching a very seriously.