Irish/Compound Prepositions

Compound Prepositions opposite ar aghaidh, os coinne, os comhair behind ar chúl, taobh thiar de during ar feadh, i gcaitheamh, i rith, in imeacht, le linn throughout ar fud looking for ar lorg like, in the manner of ar nós for the sake of ar son, thar ceann, de cheann about to ar tí as a result of, because of de bharr, dá bhrí, de thairbhe according to de réir on account of de thairbhe for the purpose of faoi choinne, le haghaidh, i gcomhair to meet faoi dhéin to the end of, to the top of go ceann in charge of, minding i bhfeighil, i gcionn along with i dteannta against i gcoinne, in aghaidh, in éadan in the middle of i lár present at, in the presence of i láthair among i measc after i ndiaidh, tar éis in place of in áit along with le cois, i dteannta, in éineacht le beside le hais, in aice (le), taobh le above os cionn in front of os coinne, os comhair near in aice (le) therefore dá bhrí sin under the care of faoi chúram at the head of ar ceann at the end of i gceann, faoi cheann in reference to um cheann (very rare) Remember: A compound preposition usually governs a genitive. But if it ends in a simple preposition, then not: in éineacht le behaves essentially as the simple preposition le. "ar" doesn't lenite a naked noun (i.e. a noun not preceded by an article) when it's part of a compound preposition or when it signifies an abstract state rather than a concrete position, or when it signifies a relative position. Cf. ar muin capaill "on horseback", but ar mhuin an chapaill áirithe seo "on the back of this particular horse". Note, though, the phrase ar fheabhas "excellent", which violates this rule (originally ar a fheabhas). Essentially the same rule applies to thar, cf. the expressions thar barr "excellent", thar fóir "beyond (reasonable) limits, beyond measure", thar cailc "beyond the chalked mark, overstepping the limit"