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are D. are。 他什么時間開始打噴嚏的?他1922年開始的。探究案1. when he was four years old.=at the age of four2. too…..to 太…..而不能….,多表示否定,可以與so …that(轉(zhuǎn)換時that 后從句用否定形式)He is so young that he can’t go to school= He is too young to go to school練習(xí): is young go to school’s too difficult for me to read this passage.It’s difficult I read this passage.3. spend some time (in) doing sth 花費(fèi)某些時間做某事spend some time on sth 花費(fèi)某些時間在某事上,看下面的例句:He started playing the piano when he was 5 years old.She is starting to cook the dinner.總結(jié)其用法,start 后可接 和 5. when 引導(dǎo)的特殊疑問句和時間狀語從句看下面的例句:①When did you begin to learn English? I began to learn Engl