1). -- This is a Conditional III sentence referring to the impossible past. 2).
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Laboriouswe can't use "a time period/ a duration" like in our example "for 1o years" with continuous tenses such as present continuous, past continuous etc.I think you are misunderstanding something in your grammar book. The present perfect continuous is a continuous tense, and you can use "for 10 years" with it.
LaboriousSo you mean to say that the structures "had + a past participle (+ a time period)" and "had + been + ing form (+ a time period) always talk about the Past, not the Present ...Yes. After if these are about an imagined past.
LaboriousBut If I want to say this in the Present, what do I need to do?You can't sa
LaboriousJust to make sure I've understoodYou have understood. You are correct about both examples.