这样说对,但这是比较正式/生硬的说法,一般口语不会用到,说出来会有点儿怪,好比一哥们儿跟你说“在下还未能作出决定”。
语法是没错。语气错了。
建议同样意思但比较随便的说法
I can't decide/ I can't make a decision/ I don't know which one to choose. 等。
I can't make a decision.
不对。应该要说“I can't make a decision.”(我不能作出决定的意思)
如果是想表达,无法作出决定:
I can't make a decision.
如果是说,无法到达目的地:
I can't arrive at the destination.