5.even if/even though 引导让步状语从句
教材例句
Native speakers can understand each other even if they don’t speak the same kind of English.
句型解读
even if/even though, 意为“即使”，用来引导一个让步状语从句，后面既可用陈述语气，也可用虚拟语气，但是even if/even though,引导的从句中不用将来时。如：Even though/if it rains tomorrow, we will leave for Beijing.
6.动词 -ing形式作状语
教材例句
One big change in English usage happened when Noah Webster wrote the American Dictionary of the English Language，giving American English its own identity.
句型解读
动词-ing形式作状语时，可表示时间、原因、结果、条件、让步、行为方式、伴随状况等，通常情况下句子的主语与该动词之间是逻辑上的主动关系，表示时间关系的分词短语有时可由when及while引出。如：Both of his parents died in the war, leaving him alone.
7.连词since引导时间状语从句
教材例句
Since middle school, my sister Wang Wei and I have dreamed about taking a great bike trip.
句型解读
连词since 引导的时间状语从句用一般过去时，介词since 与表示过去某一点时间的词语连用，副词since 后不用从句或词语。
It is/has been+一段时间+since+一般过去时(从句中的动作不能延续)自从……至今已经多久了。
since then 自从那时至今 ever since 从那以后一直
8、强调句型
教材例句
It was my sister who first had the idea to cycle along the Mekong River from where it begins to where it ends.
句型解读
强调句型It is/was…that/who 的用法归纳如下：
强调句型可以强调除谓语动词以外的任何句子成份。一般来说，如果被强调部分是人时，用连词that或who；如果被强调部分是物，只能用连词that。 强调句型应避免使用when, where, which 等连词。
含一般疑问句和特殊疑问句的强调句句型:
① 含一般疑问句的强调句型，其结构为：Is it+被强调部分+that/who+句子的其余部分？
② 特殊疑问句的强调句型结构形式为：特殊疑问词+is/was it that/who+句子的其余部分？
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