This is a mistake. A window has a pane, not a pain. . My doctor gave me good advice. This is correct. Advise would be incorrect.
Advice is a noun, advise is a verb.
This is a joke. It is vary important that you study English every day. This is a mistake. Vary means to change or deviate, while very means exceedingly or extremely. The incidence of errors has decreased since we implemented the new QC program in our company .