十五年前小明十五岁,十五年后小明几岁?

不一定是某种时态,你看：
她去世已有十年了she has been dead for 10 years
It is 10 years since she died
他们结婚已有十五年来They have been married for 15years
It is 15 years since they got married
以上两种不同的表述方法不是表达同一个意思吗?

（1）象征着日本侵略者。
（2）九一八事变。

设十五年前儿子x岁，爸爸7x岁.则今年爸爸（7x+15）岁，儿子（x+15）岁
(7x+15)+10=2[(x+15)+10]
7x+25=2x+50
5x=25
x=5
7x+15=50
x+15=20
答：今年爸爸50岁，儿子20岁

算式：
年龄差是21岁,倍数差为7倍,则
小明年龄为(15+6)/(8-1)=3岁
方程：
小明今年为x岁,则：
x+6=8x-15
x=3
小明为3岁,叔叔则为24岁

十五年前的一个下午,我摇着轮椅进入园中,它为一个失魂落魄的人把一切都准备好了.那时,太阳循着亘古不变的路途正越来越大,也越红.在满园弥漫的沉静光芒中,一个人更容易看到时间,并看见自己的身影.
自从那个下午我无意中进了这园子,就再没长久地离开过它.我一下子就理解了它的意图.正如我在一篇小说中所说的：“在人口密聚的城市里,有这样一个宁静的去处,像是上帝的苦心安排.”
两条腿残废后的最初几年,我找不到工作,找不到去路,忽然间几乎什么都找不到了,我就摇了轮椅总是到它那儿去.

这是迄今完全没错的答案：
1.I haven't played the basketball for a long time. The last time I played basketball was two weeks ago. [假定是篮球,也可改成footfall, volleyball, badminton, etc.]
2.This school was built 15 years ago; many teachers have been working here since it was founded.
3.How come you havn't finished your homework? I finished mine two hours ago.
4.He has worked in the hospital for five years; he came to Shengzhen in 2004.

45岁
十五年前15岁，现在30岁，那15年后她45岁。

1.His grandmother died ten years ago,and her death has been for ten years
2.My parents married fifteen years ago.They had been married fifteen years.
3.He took the book three weeks.
是这样的

15年前15岁,现在30岁,15年后45岁
我还可以教你整朋友
你问它一次比赛中我超过了第三名我是第几名,一般人都说第二,其实仔细一想还是第三……

son:x
dad:y
y-15=x+12
y=4x
解方程得x=9,y=36.
dad36岁.