2017届山东省成武教研室高考英语一轮人教版必修3教案：Unit 4《Astronomy_the science of the stars》period 1 warming up and reading_高考复习指南

　　Discuss the following important sentences and phrases in the passage.

　　1) 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.

　　2) The earth became so violent that it was not clear whether the shape would last or not.

　　3) They were in time to produce carbon, nitrogen, water vapor and other gases, which were to make the earth’s atmosphere.

　　4) So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.

　　Suggested explanations:

　　1) What leads a noun clause as the subject and when leads an attributive clause.

　　2) Here “whether the shape would last or not” is a noun clause as the subject.

　　3) Here “which were to make the earth’s atmosphere” is a non-restrictive attributive clause.

　　in time: 1) sooner or later; eventually 2) in time (for sth. /to do sth. ): not late

　　I will see him in time.

　　She will be back in time to prepare dinner.

　　4) In this sentence, there are two clauses led by whether. The first one is a noun clause as the subject and the second as the object.

　　to come: serves as attributive

　　She is the last person to do such a thing.

　　depend on: something might only happen or be true if the circumstances are right for it

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