求分析一道题目啊Then she prepare reliable moves to use if a new situation arises这里面to use是作什么成份

求分析一道题目啊
Then she prepare reliable moves to use if a new situation arises这里面to use是作什么成份

moves的定语,可以看作定语从句that she can use的简化
prepare应为prepares

to use it 的简化, it 相当于reliable moves