如果你听了我的建议，这本可以省下不少麻烦。
If you had followed my advice, it could have saved a lot of trouble.
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If英 /ɪf/|美 /ɪf/
had英 /hæd/|美 /hæd/
Could英 /kʊd/|美 /kʊd/
解释
if 从句用 had followed（过去完成时）表示与过去事实相反的假设（实际没听），主句用 could have saved 表示"本能省下但未省下"的机会，语气中含责备。
If you had followed my advice, it could have saved a lot of trouble.
if 从句用 had followed（过去完成时）表示与过去事实相反的假设（实际没听），主句用 could have saved 表示"本能省下但未省下"的机会，语气中含责备。