Question

---you---further problems with your printer,contact your dealer for advice.为什么选should,have

为什么不选if,had 不都是虚拟语气么 主句是祈使句 从句就不能用if 吗?请各位高手解答

Answer 1

这是一个倒装句，因此要把had放于句首

Had you further problems...
如果用if要这样用
If you have further problems...
如果再遇到打印机问题，请咨询（你的）经销商。

Answer 2

Had you further problems...

If you have further problems...