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3. What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe. ①what引导的是_____从句, what在从句中作become的_____。 ②思考:When引导的是定语从句or时间状语从句? ③主语从句中was to become是“be to do”结构,在句中表示____________的动作。 主语 表语 “将要发生” 4. The earth became so violent that it was not clear whether the shape would last or not. ①so…that…如此…以至于… ②It is/was not clear whether…不清楚是否… It was not clear whether the shape would last or not. 主 系 表 真正主语 5. They were in time to produce carbon dixoide, nitrogen, water vapor…,which were to make the earth’s atmosphere. ① in time及时, 终于 eg. The doctor came just in time. 拓展: all the time 一直, 始终 at the same time 同时 from time to time 时不时地 in no time 立刻, 马上 ②which引导的是__________________ 非限制性定语从句 6. What is even more important is that as the