Writing Practice — contraction: reducing clauses to phrases or words. Whenever writing in English, everyone should keep in mind the following principle: never use a sentence where you can use a phrase; never use a phrase where you can use a single word. In this way, your writing will become more compact and lucid. We can use gerundial phrases(动名词短语), infinitives(不定式), participial phrases(分词短语) and prepositional phrases(介词短语) to replace clauses. EXAMPLES: a)Wood gives much smoke while burning . ... while wood is burning. b) When in trouble I always turn to her help. When I am in trouble,... c). To speak English well, you need a lot of practice. If you want to speak English well, ... d) The book written by Lu Xun is my favorite. The book, which is written by Lu Xun, is ... homework 1) When they left the airport, they waved again and again to us. ———————————————————————————————— 2)After I do my morning exercises, I do my homework. ———————————————————————————————— 3) If we want to stop air pollution in our city, we really must take some measures. ———————————————————————————————— 4) While I was on the plane, I read the book. ———————————————————————————————— 5) When the powder is mixed with water, it forms a smooth paste. ———————————————————————————————— 6) The man, who is sitting on my right, is our English teacher. ____________________________________________________________________________