16.7比较if only与only if-假造语气 16.7比较if only与only if only if默示"只要"；if only则默示"如果……就好了"。If only也可用于陈说语气。例如： I wake up only if the alarm clock rings.只要... / 2010-06-08 / 查看 5 次

7.8用作介词的to-动词不定式 7.8用作介词的to to可以用作介词，也可用作不定式的标示。下面的to 都用作介词： admit to object to be accustomed to be used to stick to turn to开始 ... / 2010-06-08 / 查看 5 次

19.5功效状语从句-状语从句 19.5功效状语从句 功效状语从句常由 so…that或 such…that指导。so…that与such…that之间可以转换。例如： The boy is so young that he can't go to school.这男孩年龄太小... / 2010-06-08 / 查看 3 次

11.13 since的四种用法-动词的时态 11.13 since的四种用法 1） since +过往一个时候点（如详细的年、月、日期、钟点、1980, last month, half past six）。例如： I have been here since 1989. 1989... / 2010-06-08 / 查看 3 次

19.4目标状语从句-状语从句 19.4目标状语从句 默示目标状语的从句可以由 that, so that, in order that, lest, for fear that, in case等词指导。例如： You must speak louder so that /in order that... / 2010-06-08 / 查看 3 次

8.7go on doing/to do-特别词精讲 8.7 go on doing/to do go on to do做了一件事后，接着做另一件事，go on doing继承做正本做的事。例如： After he had finished his maths，he went on to do his ph... / 2010-06-08 / 查看 2 次

8.6try doing/to do-特别词精讲 8.6 try doing/to do try to do勉力，企图做某事，try doing实验，试着做某事。例如： You must try to be more careful.你可要多加鉴戒。 I tried gardening but didn... / 2010-06-08 / 查看 2 次

19.10默示"一…就…"的构造-状语从句 19.10默示"一…就…"的构造 hardly/scarcely…when/before, no sooner…than和as soon as都可以默示"一…就…"的意思。例如： I had hardly / scarcely got home whe... / 2010-06-08 / 查看 1 次

3.14 one，that和it-代词 3.14 one，that和it one默示泛指，that和it 默示特指。that与所指名词为同类，但不是统一个，而it与所指名词为统一个。例如： I can't find my hat. I think I must buy one.... / 2010-06-08 / 查看 1 次

8.3remember doing/to do-特别词精讲 8.3 remember doing/to do remember to do记得往做某事，remember doing记得做过某事。例如： Remember to go to the post office after school.记着下学后往趟邮局。... / 2010-06-08 / 查看 1 次