eu > en 
1 with, accompanied by, in the company of
lagunekin batera etorri da: he came with his friends
eskaera nortasun-agiriarekin batera bidali behar da: you must send your National ID Card along with the request
2 (aditz-izenari loturik) as soon as
bera etortzearekin batera egoerak hobera egin du: as soon as she came, things began to get better