Ask who, what, where, when, why, and how — plus the words that join sentences.

• Cad / Céardwhat (kod / kayrd)what | Cad atá uait? = What do you want? (Céard is the common Connacht variant of cad; both mean 'what'.)
• Céwho (kay)who | Cé hé sin? = Who is that (man)? (Cé h- before a vowel: Cé hí? = Who is she?)
• Cá / Cá bhfuilwhere (kaw / kaw will)where | Cá bhfuil an leithreas? = Where is the toilet? (Cá causes eclipsis: cá + tá → cá bhfuil.)
• Cathain / Cén uairwhen (KAH-hin / kayn OO-irr)when | Cathain a thiocfaidh tú? = When will you come? (Cén uair, lit. 'what time', is common in speech.)
• Cén fáth / Cad chuigewhy (kayn faw / kod KHIG-eh)why | Cén fáth a bhfuil tú anseo? = Why are you here? (Cén fáth lit. 'what reason'; Cad chuige is the Ulster equivalent.)
• Conas / Cén chaoihow (KUN-uss / kayn KHEE)how | Conas atá tú? = How are you? (Conas in Munster; Cén chaoi a bhfuil tú? in Connacht.)
• Cé mhéadhow much / how many (kay VAYD)how much / how many | Cé mhéad atá air? = How much does it cost? (Cé mhéad duine? = How many people?)
• Cénwhich / what (+ noun) (kayn)which / what (before a noun) | Cén leabhar is fearr leat? = Which book do you prefer?
• Cé acuwhich (of them) (kay AK-uh)which one (of a set) | Cé acu is fearr leat? = Which (of them) do you prefer?
• An(yes/no question marker) (un)question particle (turns a statement into a yes/no question, eclipses the verb) | An bhfuil tú go maith? = Are you well?
• Cén t-amwhat time (kayn tahm)what time | Cén t-am é? = What time is it?
• agus / isand (OG-uss / iss)and | tae agus bainne = tea and milk. (Unstressed 'is' is the everyday shortened form, distinct from the copula: arán is im = bread and butter.)
• nóor (noh)or | An bhfuil tú ag teacht nó ag fanacht? = Are you coming or staying?
• achbut (okh)but | Tá sé fuar ach tirim. = It is cold but dry.
• mar / toisc go / mar gheall arbecause (mor / toshk guh / mor yowl err)because | Níor tháinig mé mar bhí mé tinn. = I didn't come because I was sick. (Toisc go raibh = because; mar gheall ar + noun = because of.)