| 1 | He doesn't care at all what people say behind his back. | |
| 2 | He doesn't care at all about what others think. | |
| 3 | We had a delicious dinner at the Italian restaurant. | |
| 4 | I can't think of any difference in meaning between these two characters. | |
| 5 | When learning a foreign language, don't focus too much on grammar; seize the opportunity to express yourself fluently. |