I can't say...
我说不准
Examples
例句
1. I can't say for certain.
我不敢肯定。
2. I can't say who did the best.
我不知道谁做的最好。
3. I can't say with any certainty that eating less can be a cure for obesity.
我不确定少吃会不会有助于减肥。
Dialogue
对话
A: So who do you think will win the NBA championships?
你觉得哪支球队能赢得NBA总冠军？
B: I really can't say. Both teams this year seem really good.
我说不准。今年这两支球队的表现都很抢眼。
A: Hey there's a game on tonight. You want to watch it with me?
今晚有场比赛，要不要和我一起看？
B: That sounds great! Can your brother watch it with us?
那太棒了！你哥哥也会和我们一起看吗？
A: Well I can't say. He said he'd be home late from work.
这我可说不准。他说他会加班到很晚才能回家。