副词性从句在和主语从句有密切关系的时候要加逗号,请举例.
问题描述：
副词性从句在和主语从句有密切关系的时候要加逗号,请举例.
when an adverb clause follows the independent clause,separate these clauses with a comma unless the adverb clause is essential to the meaning of the independent clause.
请举例
答
He slept late yesterday,causing him to be sleepy in school.
他昨晚迟睡,导致他上学时精神不足.