It must be Carla's.它肯定是卡拉的。 情态动词must, may, might, could, may, can't表示推测含义与用法：后面都接动词原形，都可以表示对现在情况的揣测和推断，但他们含义有所不同。
must 一定，肯定 (100%的可能性)
may, might, could有可能，也许(20%－80%的可能性)
can't 不可能，不会(可能性几乎为零)
The dictionary {#blank#}1{#/blank#}(肯定是)mine. It has my name on it.
The CD{#blank#}2{#/blank#}(可能是)Tony because he likes listening to pop music.
The hair band{#blank#}3{#/blank#}(不可能是)Bob's. After all, he is boy!
