※ 引述《l10nel (小失)》之銘言：
: The Cambridge Grammar of the English Language, p 188 也說：
: If there should be any opposition, they will/would not go ahead with the
: plan
: (where 'will' indicates open, 'would' remote).
: 所以看法一致，should + will/would 都可以（有些書甚至傾向告訴你只該用 will）
: 可能性由高至低：
: if you experience any difficult （開放的可能）>
: if you should experience...（多了一點遲疑、保留：by any chance,「要是」） >>
: if you experienced... （可能性很小，但仍有可能） >=
: if you were to experience ..（可能性再稍小一點，或語氣更委婉，但仍有可能！）
這高低可能性排列挺有趣的。但CGEL第118頁應該沒有支持將open、
remote劃上等號，兩者不盡相同，帶有should的if子句，不該僅排於
一個位階。應要排在兩個：
If you experience ..., we are here to help you.
If you experience ..., we will be here to help you.
If you should experience ..., we will be here to help you.
If you experienced ..., we would be here to help you.
If you should experience ..., we would be here to help you.
If you were to experience ..., we would be here to help you.
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