I have seen in places expressions den chineál seo mar shampla:

Ach an teilifís a chur ar siúl, is féidir leat an cluiche a fheiceáil.

All you have to do to watch the match is to turn on the TV.

An bhfuil sé sin ceart?

Could you give me more examples in this vein le mo thuiscint a dhaingniú?

GRMA.

It's hard to english it!

Possibly "Once" would fit

Once the TV has been turned on, you can watch the match.

Ceannóidh mé an leabhar sin, ach a mbeidh an t-airgead chuige agam.

Either temporal ("when", "as soon as") or conditional ("if", "provided that"), etc.
If you turn on the TV you can watch the match.

Lars

You can also say

Cheannóchainn an leabhar sin, ach airgead a bheith agam
= Cheannóchainn an leabhar sin, dá mbeadh airgead agam

You can also think of it as "if only", as in "if only the television were turned on", "if only I had the money."

Ach, ochón, ach is casta í an Ghaeilge!

Maybe FB can help.

ach [cónasc][réamhfhocal]
(déan é ach ná caith an lá leis); taobh amuigh de (ní raibh ann ach an triúr againn; níl ann ach go n-aithním é; ach amháin mé féin); ar acht go (tá sé blasta ach salann a chur air); chomh luath is (ach mise greim a fháil air); murach (ach grásta Dé).

Agus is féidir é chuir sa Phota freisin

http://www.potafocal.com/Search.aspx?Text=ach