1. 搭配不好.indecisive有2个意思：
1）unable to make clear decisions or choices
-opposite decisive decisive
a weak and indecisive leader
2）not having a clear result
-synonym inconclusive inconclusive
a confused, indecisive battle
不能用来修饰一个时间.改为undecided
2. 介词搭配错误
helpful in doing sth
We hope this leaflet has been helpful in answering your questions.
helpful advice/hints/suggestions etc
改为in improving