cyclopaedia

• When john has to write a report , he will be check the cyclopaedia
  约翰必须写报告时，就会查阅百科全书。
• Join will refer to the cyclopaedia when he relady to write a report
  约翰必须写报告时，就会查阅百科全书。
• John would have consulted the cyclopaedia , if he has to write a report
  约翰必须写报告时，就会查阅百科全书。