1. have done（现在完成时）和have been doing（现在完成进行时）

• 相同点
  1. 都可以表示从过去某一时刻开始一直延续到现在的动作。
  • I have worked in this school since 2001.
  • I have been working in this school since 2001.
  2. 都可以表示一段时间内进行的动作
  • Mr. Smith has taught English for 20 years.
  • Mr. Smith has been teaching English for 20 years.
• 不同点
  1. 现在完成时可表示已经完成的动作，常与already 、ever连用：
  • We have already learned Module. 我们已经学习了第三模块.
  • She is the most beautiful girl I have ever seen. 她是我见过的最漂亮的女孩.
  2. 现在完成进行时表示从过去开始的事一直持续到现在
  • I have read the novel. 我看过那本小说了. (已看完)
  • I have been reading the novel. (一直在看)

2. call 和 called 区别

1. sb call sb sth
   • my friend call me Zebro
2. sth be called sth / sth called sth
   • I have a book called "Mamba Mental"
   • The dog is called Puppy.

3. people 和 peoples

1. people本身就是person的复数，如果说peoples，那么就代表有很多“人们”，peoples 的意思是：拥有共同的信仰,文化,语言,或者同样的生活方式的人们/团体.
   • the peoples of the Americas. 美洲的人们