(1/2)说到给老人应有的尊敬.when it comes to giving due respect to the old people 为什

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(1/2)说到给老人应有的尊敬.when it comes to giving due respect to the old people 为什
(1/2)说到给老人应有的尊敬.when it comes to giving due respect to the old people 为什

(1/2)说到给老人应有的尊敬.when it comes to giving due respect to the old people 为什
这个是属于固定的用法 when it comes 当谈到.(某某话题)

when it comes to 当提到…

作为情态动词表“必须”,这时反意疑问句直接用mustn'/needn't
2)当must表示推测时又分以下几种情况:
a:对现在事实的推测,反意疑问句与must后面的动词呼应,如:
You must be joking,aren't you ?