副词为什么叫副词 从零开始学语法：具有连接作用的副词

从零开始学语法：具有连接作用的副词  

英语里有一些连接副词，这类具有连接作用的副词又叫做准连词。,besides 此外,I am too tired to go; besides, it's too late.
我很累不能去，此外，天色也晚了。,hence 因此,My mother is by herself; hence I must go home now.
我妈妈独自一人在家，因此我现在必须回去了。,meanwhile 与此同时,Mother went shopping; meanwhile I cleaned the house.
母亲去购物，与此同时我打扫房间。,moreover 此外,Bicycling is good exercise; moreover, it won't pollute the air.
骑自行车是一种很好的运动，此外，还不污染空气。,then 此外，还有,I was there; then there were my mother and father.
我在那儿，此外，我的爸爸妈妈也在那儿。,therefore 因此,I think; therefore I am.
我思故我在。,thus 因此,It's late, and thus you must go.
天晚了，因此你必须走。,下面来看几个连接副词在作副词和连词时的区别：
,However,however 作副词时，可位于形容词/副词之前：,You couldn't earn much, however hard you worked.
无论你干得多卖力，你都挣不了多少钱。
,however 作连词时通常意为“但是”，可位于它所引导的从句之前或之后，或位于第一个词或短语之后：,I'll offer it to Tom. However, he may not want it. / He may not want it however. / Tom, however, may not want it.
我将提出把这个给汤姆，然而他可能不要它。,但提到两句意义相反的话时， however意为“但是/仍然/同样”：,They hadn't trained hard, however ( / but / nevertheless / all the same) they won.
他们并没有刻苦训练，但/无论如何/仍然/同样获胜了。,Otherwise
,otherwise 作为副词时常常位于动词之后：,It must be used in a well-ventilated room. Used otherwise it could be harmful.
必须在通风条件好的房间里使用。如不这样使用则可能是有害的。,otherwise 作连词时意为“要是不/否则”：,We must be early; otherwise we won't get a seat.
我们得早点去，否则我们就没有座位了。,在英语口语中，这里也可用or：,We must be early or（else）we won't get a seat.
我们得早点去，否则我们就没有座位了。,So
,so 作程度副词，位于形容词/副词之前：,It was so hot that...
天气太热了，因而……,They ran so fast that...
他们骑得太快了，因而……,so 作连词时位于它所引导的从句之前：,Our cases were heavy, so we took a taxi.
我们的箱子太重了，所以我们要了辆出租车。,Still & Yet
,still 和 yet 可作时间副词：,The children are still up. They haven't had supper yet.
孩子们还没上牀睡觉/醒着。他们还没吃晚饭呢。,still 和 yet 作连词时位于它们所引导的从句之前。still 意为“虽承认某事/尽管如此”；yet 意为“不管，不顾/同样/尽管如此”。,It's raining; still I'd like to go.
天下着雨，尽管如此，我还是要去的。,They are ugly and expensive; yet people buy them.
它们既难看又昂贵，但人们还是买。