I always been very fit and healthy, and I have had a serious illness. However, a couple of weeks , I caught the flu. I must admit that until then, I not realised just how unpleasant the flu could be. I had a high temperature for nearly a week, and my whole body hurt. I don't think I have felt so miserable. It's taking me ages to get my strength back. It really bothers me that I haven't had enough energy to play football I got ill. In fact, I have been to the doctor to ask if it's normal to feel weak for so long. He says I'll soon feel better. Apparently I'm lucky. For some people, especially the old and the weak, the flu can be very serious. Doctors have tried years to find a cure for the flu, but they haven't found one . Fortunately, researchers have developed a vaccine which gives effective protection against the disease. According to my doctor, most of his elderly patients have received their flu shots.
Perfect! You completed the exercise with 100% correct answers.
You've mastered the present perfect tense!