第一天：
1. 句式：
sb can barely do sth... 某人勉强做某事.
keep /hold one's eys open a. 睁着眼睛 b.保持清醒
i can barely keep my eyes open.
2. 表示很累很困
a. I feel sleepy.
b. I'm too sleepy.
c. I'm nodding off.
d. I'm gonna take a nap.
e. I could do with a nap.
f. I'm exhausted.
g.I'm spent.