①As a saying goes写植物的作文，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写植物的作文，I couldn't have won first prize.(虚拟语气)