【正文】
百計(jì)的(游)人?! ?have been asked to keep the woods clean and 。 句中 have been asked是被動(dòng)語態(tài)的完成時(shí)結(jié)構(gòu)。(詳見本課語法部分。)to keep the woods clean and tidy是動(dòng)詞不定式短語,作主語visitors的補(bǔ)足語。clean and tidy 是賓語 the woods 的賓語補(bǔ)足語?! ?for a walk,去散步?! ?I saw made me very ?! 【渲械闹髡ZWhat I saw 是 what 引導(dǎo)的名詞性從句。