吃透这200个语法公式！你的英语语法就牛了！

* 语法公式①be busy (in) doing sth.意为“忙于做某事”。 We’re busy (in) doing homework after school every day.我们每天放学后都忙于做作业。 * 语法公式②have difficulty/trouble (in) doing sth.意为“做某事有困难”。 I have some trouble (in) working out this problem.解出这道题我有些困难。 * 语法公式③stop/prevent...(from) doing sth.意为“阻止……做某事”。 We must stop him (from) going to swim in the river.我们必须阻止他去河里游泳。 * 语法公式④It + be/get+形容词/名词/介词短语 it用作非人称代词时，常表示天气、 日期、时间、距离、温度等。 It gets colder and colder.天气变得越来越冷。 * 语法公式⑤It + be +被强调部分+that...构成强调句，强调句子的主语、宾语、状语。被强调部分指人时，that可以换成who，其他情况一律用that。 It was not until I came here that I realized this place was famous for not only its beauty but also its weather.直到我来到这里我才意识到这个地方不仅以美景闻名,而且它的天气也很有名. * 语法公式⑥It+be+形容词(+for sb.)+to do sth. It is very important for us to master the skills of computers.对于我们来说，掌握计算机技能是非常重要的。