[助动词] 能, 会, 可能会, 可以. (can 的过去式)
I was so tired that I could not do my homework.
我太累了以致於没办法做 (我的) 家庭作业.
It could be weeks before we know the real story of this event.
[动 词] 吃(东西), 喝, 进食, 用膳.
I can not eat any more.
I am so hungry that I could eat a horse.
[动 词] 吃(东西), 喝, 进食, 用膳. (eat 的过去分词)
I have not eaten lunch yet.
It is said that the little boy has been eaten by a tiger.
[名 词] 八, 八个.
At the age of eight, she began to learn English.
[形容词] 八的, 八个的.
Please come here before eight o'clock.
请在八点 (鐘) 之前到这裡.
[名 词] 十八, 十八个.
Two times nine is eighteen.
[形容词] 十八的, 十八个的.
There are eighteen students in the classroom.