- 2017-05-18[David] unit15 Where wre you born
- 2017-04-19[David]什么时候用一般现在时
- 2015-10-28[David] 8:How to take good photos
- 2014-12-30[David] 7: Appearance
- 2014-12-30[David] 6: Identifying People
- 2014-12-26[David] 5 : Describing Objects
- 2014-12-26[David] 4:Objects
- 2014-12-15[David] 3 : Introduction
- 2014-12-15[David] 2 : Name
- 2014-12-12[David] 1: Greetings