How to say it´s an excellent piece of work you´ve certainly been polishing your skills, haven´t you! in Japanese
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なかなかなかなか(nakanaka) (adv,adj-na) very/considerably/easily/readily/fairly/quite/highly/rather/by no means/not readily/middle/half-way pointのの(no) (prt) indicates possessive/nominalizes verbs and adjectives/substitutes for "ga" in subordinate phrases/indicates a confident conclusion/ indicates emotional emphasis/indicates question出来出来(deki) (n,vs) occurrence/happening/taking placeだだ(da) (aux) be/is/indicates past or completed action/indicates light imperative君君(kun) (pn) you/buddy/pal/monarch/ruler/sovereign/masterもずいぶんno dictionary result, likely a conjigated verbno dictionary result, likely a conjigated verb腕腕(ude) (n) arm/skillをを(wo) (prt) indicates direct object of action/indicates subject of causative expression/indicates an area traversed/indicates time over which action takes place/indicates point of departure or separation of action/indicates object of desire, like, hate,磨磨(ma) (v) grind/polish/brush(teeth)いい(i) (prt) strengthens a question, assertion, etc.たじゃno dictionary result, likely a conjigated verbない(aux-adj) not/emphatic suffixかか(ka) (prt) indicates question/indicates choice, doubt, etc.
