friend和friends的区别：friend是单数，指一个朋友。friends是复数，指有超过一个的朋友。如：He is my good friend（他是我的好朋友）。I have a lot of friends（我有许多的朋友）。
I had a long talk about this with my best friend（我和我最好的.朋友就此事进行了长谈）；I also had friends who gave me a great deal of encouragement（我还有些朋友给了我很多鼓励）。
