Depends on how clear you want to be understood: ie a product can have a high/medium/low or excellent/good/poor 'Standard' and that is it. However - you can have any number of 'criteria' that you would need to elaborate further on. These

not really as they are different tenses... IE, I can go - means you are able to go full stop I could go - means you can if a certain condition is met - eg I could go, but I'm feeling tired. or I could go.....if the rain stopped does

Am I correct in saying that you cannot use the phrase: "If you want any more information reply to either myself or my colleague" as 'myself' is a reflexive verb. Should it just be - reply to 'me' or my colleague???

Hi there, as far as I know Will, Shall, Can are all modal verbs used with present and other tenses. Would, Should, Could are verbs of the conditional tense. Eg: I can (am able to) go to the shops = modal verb and present tense of to