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

• τιtiwhat | Τι θέλεις; = What do you want?
• ποιοςpioswho | Ποιος είναι; = Who is it? (masculine; ποια for feminine, ποιο for neuter)
• πούpouwhere | Πού είναι η τουαλέτα; = Where is the toilet? (accented πού = 'where'; unaccented που = 'that/which')
• πότεpotewhen | Πότε φεύγει το τρένο; = When does the train leave?
• γιατίyiatíwhy / because | Γιατί κλαις; = Why are you crying? (same word answers 'because': γιατί ήμουν άρρωστος = because I was sick)
• πώςposhow | Πώς σε λένε; = What's your name? (lit. how do they call you?) (accented πώς = 'how'; unaccented πως = 'that')
• πόσοpósohow much | Πόσο κάνει; = How much does it cost?
• πόσαpósahow many | Πόσα άτομα είστε; = How many people are you? (neuter plural)
• πόσοιpósihow many | Πόσοι ήρθαν; = How many came? (masculine plural; πόσες for feminine)
• ποιοpiowhich (one) | Ποιο θέλεις; = Which one do you want? (neuter; agrees with the noun in gender)
• καιkeand | Εγώ και εσύ. = Me and you.
• ήior | Τσάι ή καφέ; = Tea or coffee?
• αλλάallábut | Θέλω, αλλά δεν μπορώ. = I want to, but I can't.
• επειδήepidhíbecause (sentence-initial / more explicit) | Επειδή βρέχει, μένουμε σπίτι. = Because it's raining, we're staying home.
• τι ώραti órawhat time | Τι ώρα είναι; = What time is it? (lit. what hour)
• πόσων χρονώνpóson hronónhow old | Πόσων χρονών είσαι; = How old are you? (lit. of how many years)
• μήπωςmíposby any chance (softener for polite yes/no questions) | Μήπως ξέρετε πού είναι ο σταθμός; = Do you happen to know where the station is?