What is the difference between the adverbs ade and daŭre?
- Li ade biciklas. / Li daŭre biciklas.
- Mi ade laboras kiel instruisto. / Mi daŭre laboras kiel instruisto.
- Ĉu vi ade verkas? / Ĉu vi daŭre verkas?
What is the difference between the adverbs ade and daŭre?
Edit (July 15, 2017): Because this old answer has received two downvotes in the last 5 days, I would like to underscore that the bold text in the second line of my answer below is a first order approximation. That is, it's not 100% true, but it's true enough - and my answer goes on to explain why. It's essentially the same thing that Airvian and and Lumo5 say in their answers.
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To a first order approximation, the difference is simple.
People who are being taught the word ade in the Duolingo course are being done a disservice. The decision to use words like ade is the result of a quirk of the Duolingo system which requires the teaching of whole words, thus limiting the options available to the course authors for teaching Esperanto affixes.
A Google search turned up 27 references in Duolingo to daŭre and 16 to ade. Of these, a higher proportion of the ade hits appear to be actual sentences in the course - giving the impression that ade is a common word.
Compare this to the Tekstaro where there are close to 400 hits for daŭre and only 10 for ade.
The above was a first order approximation. The details are more nuanced. Clearly ade is a real word - but it is not a common one. If you're trying to say something, chances are more likely that you're trying to say daŭre.
But yes, ade even has its own entry in PIV (although it's difficult to find.)
Summarizing from PIV, daŭre has to do with staying in the same state and not quitting. It does not mean the same thing as plu (further). For example "daŭre labori" means to work for a long time, not just to continue in ones work. On the other hand ade contains the additional nuance of continuing or repeating action.
Ne ekzistas signifa diferenco. Preskaŭ ĉiuj afiksoj povas esti uzataj memstare:
I just finished The Hobbit a few weeks ago and ade was actually used a lot but besides in that book I've never really seen it much.
Daŭre = Continually
Ad is an affix. I have never seen that usage of it before. It should be like the following:
Li bicikladas. Mi laboradas... Ĉu vi verkadas.