怎么把下列句子改为简单句(或 结果状语从句 或 目的状语从句)

问题描述:

怎么把下列句子改为简单句(或 结果状语从句 或 目的状语从句)

1.The shelf was so tall that he couldn't reach it.(要两句)2.Harry is so intelligent that he can solve the difficult maths problem.3.The flat was so expensive that we couldn't buy it.(要两句)4....