①As a saying goes，the little thing matters most.

 　　→As a saying goes，it is the little thing that matters most.(强调句) 

　　②The children can grow up healthy mentally and physically only in this way. 

　　→Only in this way can the children grow up healthy mentally and physically.(倒装句) 

　　③If it is so，I hope you will have a wonderful time. 

　　→If so，I hope you will have a wonderful time.(省略句) 

　　④It is a very splendid moment. 

　　→How splendid a moment it is!/What a splendid moment it is!(感叹句) 

　　⑤I won first prize with my teacher's help. 

　　→Without my teacher's help，I couldn't have won first prize.(虚拟语气)