Units 3-4重点句型解析

摘要

1.unless引导条件状语从句【课文原句】You should not go rafting unless you know how to swim,and you should always wear a life jacket.【经典考例】We won't keep winning games____we keep playing well. (NMET 2006浙江卷) A.because B.unless C.when D.while【考点解析】句意"