Lesson on 都 all, both and 'even'

 1. 都是我的錯，都怪我 It’s all my fault. I’m the only one to blame.

→ Both the 都 used in the sentence mean “all”, but what exactly is the speaker’s fault is omitted. 
 2. 大人都吃不下，更別說小孩了 Even adults can’t finish eating this, let alone kids.
 → Here 都 is used to provide emphasis and express extremeness. It’s often used with 連（连）in the sentence pattern: 連…...都...... （连…...都......）even 
 3. 都下午了！他還沒起床？It’s afternoon already! He still hasn’t woken up (yet)? → 都 here is used to provide emphasis and show that the speaker thinks that this is surprising or unusual.