Discovering useful structuresNoun clauses as the subject4. To find your way can be a problem. What does the underlined part serve as in each sentence? 3. Smoking is bad for you.2. You are a student.5. “How do you do?” is a greeting.subject1. Beijing is our capital. 主语从句 (Subject Clause)在复合句中充当主语的从句就是主语从句。That he will succeed is certain.Whether he will come makes no difference.What we need is more time.找出主语从句思考：主语从句有哪些引导词，这些引导词如何选用？ That he will come is certain. Whether he will come is uncertain.
