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.the maths problem was so difficult that no one could solve it.
把下列句子改为结果状语从句
Jim ran quickly enough to win the first prize.把下列句子改为目的状语从句