I have found this sentence "If I had been in better health, I would have joined you." and I would like to ask whether it is subjunctive or past perfect?
thanks
You need to make a distinction between "tense", "aspect", and "mood". The tense of your sentence is past. Its aspect is perfect.
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You need to make a distinction between "tense", "aspect", and "mood".
The tense of your sentence is past.
Its aspect is perfect.
Its mood is subjunctive.
Note that all unreal conditionals have the subjunctive mood.
Overall, it's past perfect subjunctive. Now make a comparison between your sentence and the following, which is past perfect indicative.