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Unit 4 Astronomy: the science of the starsPeriod 4 grammarTeaching goals 1 Target languagea重點詞匯和短語 suffer, settle , realize , worry about , have got to, tie up b重點句子: He was very disappointed. What it was to bee was a mystery. To save money, you must use as few words as possible.c. Practise talking about problems in study or lifeMy problem is… The difficulty is… My trouble is…The question is… My advice is… What I think about it is…The fact is… My suggestion is…Teaching important points the use of Noun Clauses as the subjectStep 1 Revision 1. Check retelling of the passage.The explosion of the earth produced water vapor, which turned into water when the earth cooled down. Water allowed the earth to dissolve harmful gases into the oceans and seas. That made it possible for life to begin to develop. The arrival of small plants encouraged the development