"Although" is used to show limitations, differences, and contrasts in situations. It's similar to "even though" and "though."
1. Although prescription medicine can help cure a disease, it can hurt you if you take too much.
("Although" usually appears at the beginning of a sentence.)
3. Although it tastes good, candy is really bad for your teeth and for your body.
4. He's not as healthy as he looks although he works out a lot and he's very strong.
5. Although he's very careful when riding a motorcycle, he still takes many risks by not wearing a helmet.
Next: Lesson Eleven