is是系动词,后面跟名词、形容词、数词或者介词或者这些词构成的短语,做句子的表语部分。
is：
be 的第三人称单数现在时形式，常放在其他词后缩写为 -’s；
过去式： was
This drug is known to have adverse side effects.
众所周知，这种药具有不良副作用。
It is important that students develop an awareness of how the Internet can be used.
重要的是学生逐渐懂得如何使用互联网。
Inflation was so high that the notes were like Monopoly money.
通货膨胀严重，货币变得跟“大富翁”游戏钞票无异。
She was still half asleep when she arrived at work.
她到了上班地点时仍然睡眼惺忪。
The space available is not adequate for our needs.
现有的空间不能满足我们的需要。
温馨提示：
