If you should happen to see Jim,
give him my best wishes.
请老师分析一下 If you should happen to see him, 谢谢!
If you should happen to see him 的意思就是 If you see him,只不过前面一种说法更委婉(“见到他”的可能性更小)。比如下面的表达,从上往下,一个比一个更委婉:
If you see him
If you should see him
Should you see him
If you happen to see him
If you should happen to see him
Should you happen to see him
Should you by any chance happen to see him
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