my uncle is already 85and an old man like him----be very forgetfula must b can为什么不能用A B不是表示否定时的推测吗

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myuncleisalready85andanoldmanlikehim----beveryforgetfulamustbcan为什么不能用AB不是表示否定时的推测吗myuncleisalready8

my uncle is already 85and an old man like him----be very forgetfula must b can为什么不能用A B不是表示否定时的推测吗
my uncle is already 85and an old man like him----be very forgetful
a must b can
为什么不能用A B不是表示否定时的推测吗

my uncle is already 85and an old man like him----be very forgetfula must b can为什么不能用A B不是表示否定时的推测吗
不是哦·
must be 和can be 都可以表示推测,只是must be 就是肯定的意思,显然不合适.难道除了他叔叔意外,其它八十五岁以上的老人铁定就都健忘吗?
如：Then you must be my cousin.那么你一定是我的远亲了.
欢迎追问

must be 和can be 都可以表示推测 must be 是说肯定是
can be 比must be 语气弱

B答案没错，can可以用于肯定句，表示习惯性或经常性的可能。
如：Monkeys can naughty at times.

That man is my uncle. My uncle is a bus he is my uncle 复数 my uncle is a farmer The man is my uncle.用my uncle提问. He is my uncle划线提问 my uncle划线 my uncle is watering the trees 对my uncle 提问 My father'brother is my uncle 对不对 My uncle's son is my c_____. My uncle is my g_________ son . My uncle is my g________ son. this is my uncle.对uncle提问.应该怎么提问. This is my uncle Jimmy.中文是什么意思? This is my uncle (改为一般疑问句) That is my uncle.改为否定句 That is my uncle?改为一般疑问句 my uncle is daughter前面一个单词 the uncle's children is my