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当你想在日记中谈论某件事时，就可以用句型when it comes to....引出话题，它的意思是谈到，涉及后面接名词或动词，因为to是介词，所以要用动名词形式，比如when it comes to saving money, she keeps silent. when it comes to this question,we had better make it clear.

大家不要看到come to ,就想当然将它理解为来到。。下面再举个例子mark is a talkative guy,but when it comes to family stuff,he does not talk much.

此外，短语，as regards to 则可以用来表达谈到，关于 as regards to budget,he still thinks the plan costs too much.
refer to也有谈到涉及的意思，比如this is a question referring to one‘s’ reputation.
常用句collection

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