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关于现在完成时的用法he can't be ill he can't have been ill .哎 弄不懂这两者到底

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关于现在完成时的用法
he can't be ill
he can't have been ill .哎 弄不懂这两者到底要用在什么情况下,希望能够简洁的说明下,而不要搬一堆语法来给我说明.
关于现在完成时的用法he can't be ill he can't have been ill .哎 弄不懂这两者到底
第一句 he can't be ill 译为 他不会生病, 此句是一般时态,意为他现在的身体状况很好,不会生病. 第二句,he can't have been ill 译为： 他不可能是生病了.这句有些难懂.意为他不可能是生病了,一定是有别的原因. 比如：他今天没来学校,不可能是生病了,一定是别的事情.
He can't have been ill是现在完成时? He can't have been ill. He isn't at school .I think he ( )be ill.can,shall,must,has He can’t come because of _____ 【ill】 Mike ill today. He can't go to school改错 He must have been ill,___ he? 看答句写问句 ( No,he can't.( I can see four.( Wei Fang is ill at h Beause he is ill,so he can't go to school today. He can't come because he is ill. 改同意句 Tom’s father has a bad ______ (ill),so he can’t go to work t he isn't at school i think he -----be ill He must be ill ,for he isn't here.