Also, in the following sentence, the subject is plural, but you edited the verb as singular.<br />As I mentioned before, the document needs to be thoroughly edited. I can see several sentences that are not understood well. Can you tell me if the singular verb is correct?<br /><br />LET ME KNOW SOON.<br /><br />YOUR EDITED SENTECE IS BELOW.<br /><br />"the presence of sulfur and its compounds <strong>causes</strong> detrimental issues including but not limited to corrosion.."<br /><br />Is "causes" correct??