is be,is to be,will be 和is being 用法区别
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is be,这种形式不正确,因为is是be动词,后面不能再加动词原形be;is to be,表示“已经确定,确信,确认“之意.例:The boy is to come here.男孩确定要过来.will be ,是一般将来时,后面加名词,代词等可以做表语的成分.例:She will be here tomorrow.她明天在 这里.is being ,可以看做是现在进行时的被动语态的构成形式.例:He is being hit by Father. 主动句是:Father is hitting him.