ago, before

形容詞 ago:

1. gone by; or in the past
   同義詞：agone

副詞 ago:

1. in the past

1. It happened quite some time ago.
   那是很久以前的事。
2. They were supposed to be here an hour ago.
   他們應該在一小時以前到達這里。
3. The population has increased from 1.2 million 10 years ago to 1.8 million now.
   人口從10年前的120萬已增加到現(xiàn)在的180萬。
4. All that happened many moons ago.
   那一切都發(fā)生在很久以前。
5. There were lots of buffaloes in the North America 100 years ago.
   100年前，北美有大量的野牛。
6. Long ago enormous animals lived on the earth.
   很久以前，地球上生活著巨大的動物。
7. He joined the army a year ago.
   一年以前，他參軍了。
8. He came here two years ago.
   他兩年前來到這里。