1. “人+ be +数字 + (years old)” 表“某人多少岁了”。
如：The little girl is eight (years old). 这个小女孩8岁了。
She is only one and a half (years old). 她只有一岁半。
2. “ one's age + be + 数字”表“某人的年龄是多少。
如：My grandma's age is eighty. 我奶奶已80高龄了。
Their ages are eleven and thirteen. 他们的年龄是11岁和13岁。
3. “ in one's + 整十数的复数形式”表“某人的岁数是多少了”。
如：(be) in one's teens 十几岁( 13-19 岁)
(be) in one's twenties / thirties / forties / … 二十多岁 / 三十多岁 / 四十多岁……
如：In the 1870s，when Marx was already in his fifties，he round it important to study the situation in Russia，so he began to learn Russian. 在19世纪70年代，马克思五十多岁时，他认为研究俄国的形势很重要，便开始学习俄语。
4. 表“不确定的岁数”时，可借助介词 above，over below，under，nearly，close to，between … and等。
如：over / above thirty 三十多岁
below / under thirty 不到三十岁
nearly / close to thirty 将近三十岁
about / around thirty 大约三十岁
Their English teacher is between 20 and 30. 他们英语老师的年龄在二十岁至三十岁之间。
5. 一年四季可用来象征人一生的不同时期。
如：(1) the spring 可指人的“青春期”。
如：It's easy for middleschool students to grow tall because they are in the spring of the life. 处于青春期的中学生易长高。
(2) the summer 指“壮年时期”。
如：My English teacher is in the summer of his life and he works very hard.
我的英语老师正当壮年，他工作很努力。
(3) the autumn 指“中年或暮年”。
如：When Karl Marx was in the autumn of his life，he began to study Russian.
当马思克中年时，他才开始学俄语。
(4) the winter 指“老年”。
如：Our maths teacher is in the winter of his life，but he still likes maths very much.
我们的数学老师年老了，但他仍十分喜欢数学。
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