1. It depends on context, but I don't think it's always necessary to use an article before these terms when writing sentences about them.
2. There's no rule about listing the order of verb tenses. I can understand why they might be listed either way.
I think we more often see them listed as you showed because the forms tend to increase in complexity (use more/longer words and are more complicated to diagram on a timeline) in that order. Listing the continuous tenses together makes sense also, because they are more closely related in style.
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