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‘-을까요?/ㄹ까요?’ is used for suggestion to the listener like ‘Shall we…?’. If the verb stem ends with a vowel or ‘ㄹ’, then use ‘ㄹ까요?’. If the verb stem ends with a consonant except ‘ㄹ’, then use ‘을까요?’.

● 우리 좀 쉴까요? (Shall we take some rest?)
● 뭘 먹을까요? (What shall we eat?)