the east东方，the west西方，the south南方，the north北方，the right右边，the left左边
例：The birds are flying to the north. 这些鸟向北方飞去。
The moon rises in the east and sets in the west. 月亮从东方升起，在西方落下。
The wind was blowing from the south. 风从南方吹来。
例：The river is two thousand kilometers long from west to east. 这条河自西向2000公里长。
They traveled through the country from south to north. 他们自南向北在这个国家旅行。
例：Summer is the hottest season of the year. 夏天是一年中最炎热的季节。
She is the best person for the job. 她是最适合这个工作的人。
定冠词用在序数词前，也用在表示序列的next, last等前，还有在表示"同一"或"唯一"等的词前。
例：The first man to land on the moon is an American. 第一个登上月球的人是美国人。
She was the fifth to climb to the top of the mountain. 她是第五个到达山顶的人。
This may be the last chance. 这可能是最后一次机会。
a 序数词表示"又一"时，前面用不定冠词a(an)
例：He bought a second pair of shoes. 他又买了一双鞋。
He asked a question, then a second, then a third…他问了一个问题，又问了第二个，第三个……
例：George arrived first. 乔治第一个到。
=George was the first person to arrive.
Jim and Jack are both second in the match. 汤姆和杰克在比赛中并列第二。
例：The orange is a kind of fruit. 橘子是一种水果。
The horse is a useful animal. 马是一种有用的动物。
The computer is important to us. 电脑对我们来说是重要的。
不定冠词+单数名词，不带冠词的复数名词也可表示一类人或物。
例：A car runs faster than a bus. 小汽车比公交车跑得快。
Cars run faster than buses.
例：She can play the piano. 她会弹钢琴。
He plays the violin very well. 他小提琴拉得很好。
He played the guitar for the children. 他给孩子们弹了吉他。
但乐器名词表示具体的器物，或表示课程时，不加the.
例：He bought a piano last month. 他上个月买了一架钢琴。
She taught piano in the school. 她在学校里教钢琴。
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