Translation:I remember having seen these paintings.
Yes, it's the perfect participle, also known as the past participle with "having". See: http://www.englisch-hilfen.de/en/grammar/participles_form.htm
You can also say "I remember seeing those paintings", which is the progressive or continuous past tense.
"I remember having seen..." implies a more complete memory: you remember the trip to the museum and the paintings on the wall.
that took a lot of googling!
It's very good English. Most Americans might say "I remember seeing these paintings"
What you mean with good english is it formal to say this?? What tense is this sentence??
"remember seeing" is more informal and common, but "remember having seen" is still normal usage.
I knew "to have seen" was wrong in this context, but changed "having seen" after looking at Duo's "hint". Note to self: stop second-guessing Duo! :-)
Second guessing might still be needed. I got different hints, wrote "I remember I have seen these paintings" and got it wrong.
Same here, because so far I have never encountered a "perfect participle" and this was the best I could do with what I have learned about present perfect tense (like he visto, ha visto). So now I see that using the actual infinitive form of a verb with the past participate (haber visto) means "having seen."
I think, this is the first time an "infinitive + participle" construction appeared on Duolingo... I remember having lessons on the present and past tense conjugations of haber followed by the participle before on Duolingo but not the "infinitive + participle"... anybody else seen it before on Duolingo?
Nope. This is the typical "Hi, I'm a perfect stranger to you and I've come to take your heart" Duolingo strategy.