Θέλεις άλλο φαγητό; = you want more food?
Θέλεις ακόμα λίγο; = you want a little more?
In the plural-polite form:
Θέλετε άλλο φαγητό; = would you like more food?
Θέλετε ακόμα λίγο; = would you like a little more?
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.