I am not sure. 我不确定。
既然不确定就不能使用 must be ，它的意思是：一定是。 如果使用must be就前后矛盾了。
只能选might, 意思是：可能
这辆自行车可能是爱丽丝的。我不确定。
couldn't 和can't 表示不可能是.... 也是必须比较确定的时候才这么说，也就是和 I am not sure.前后矛盾了。
qi...
This bike must be Alice's.I am not sure.
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