高中英语AS的用法总结 (共12张PPT)

As 用法小结 as用法归纳 as词性多，词义广，用法灵活。现将其用法归纳如下： Ⅰ. as 作副词，表示程度，意为“同样地”。在“as…as”, “not as…as”结构中的第一个as是副词，作“和/与…(不)一样”解。e.g ①Jack is as tall as his father. ②He doesn’t speak English as/so fluently as you. Ⅱ. As作连词，主要引导以下状语从句： 1. 引导时间状语从句。与while意义相近，强调两个动作同时发生；或某事一发生，另一事立刻发生。e.g ① He shouted aloud as he ran along. ② I was startled as he opened the door. ③ We get wiser as we get older. 2. 引导原因状语从句，与because的用法相近。 e.g ① As it was getting very late, we soon turned back. ② We must stop writing now, as I have rather a lot of work to do. 3. 引导方式状语从句，作“正如，好象，按照”解。主要的句式有as if(as though);just as;just as…as . e.g ① When at Rome, do as Romans do. ② We do farm work as the old peasant teaches us. ③ When a pencil is partly in a glass of wat