三、till, until, 和not….until

1．肯定句：主句谓语动词必须是延续性动词，主句、从句都是肯定式，意为“某动作一直延续到某时间点为止”。如：

Son: Remember, Dad, Thomas Edison got bad grades in school, too.

Father: Stay in your room until you invented the light bulb.

儿子：记住，爸爸，爱迪生上学时成绩也很差。

父亲：呆在你房间里，直到发明出灯泡。

Whenever I feel like exercise, I lie down until the feeling passes.

每当我想锻炼时，我就躺下直到这种感觉消失。

注：这个人是真不想锻炼。

I was an atheist[无神论者] until I realized I was GOD.

在我认识到我是上帝以前我是一个无神论者。

注：这种话应该是象尼采一类的狂人说的。

2．否定句：主句谓语动词必须是非延续性动词，从句为肯定式，意为“某动作直到某时间才开始”。如：

I am convinced that both my long age and exceptional health are to be explained by

an obvious facts: I never touched a cigarette, a drink, or a girl until I was almost ten

years old.

我深深相信我的长寿和我格外健康可以由一个显而易见的事实来解释：我从来没有接触过一根烟、一口酒、一个女孩子，在我差不多10岁以前。

（我直到差不多10岁才接触烟、酒、女孩子。）

Horse owner: This horse is eight-years- old and he’s never raced before.

Jockey: How come?

Horse Owner: Well, we couldn’t catch him until he was seven.

马主：这匹马8岁了，他以前从来没有参加过比赛。

职业骑师：怎么会呢？

马主：直到他7岁我们才抓住它。

3．Till不可以置于句首，而until可以。

Until the horse was seven we couldn’t catch him.

4．Not…until句型中的强调和倒装。

It was not until he was seven that we could catch him .（强调句型）

Not until he was seven could we catch him.（not until置于句首，主句要倒装）

四、before和since

1．若表达“还未…就….；不到…就….；才….；趁…；还没来得及”时，需用连词before。（都可以理解成是“在…..之前”）

I have to exercise early in the morning before my brain figures out what I\'m doing.

每天一大早儿趁我的大脑还不知道我在做什么之前我必须锻炼。

注：早上起床后晕晕忽忽就开始锻炼，等大脑清醒后，就不想锻炼了。

If people waited to know one another before they married, the world wouldn’t be so over-populated.

如果人们都要等相互了解对方后才结婚，世界人口就不会这么过剩了。

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