The plural of 'thief' is: MCQ with Answer and Explanation

Explanation:
When used as adjective, it's 'six-foot tall', but often 'six-foot' is accepted. 'Six foot tall' without hyphen is sometimes used, but the standard is 'six-foot-tall' or 'six feet tall' (not as adjective). So 'six foot' might be error if not hyphenated. I'll say no error; many accept 'six foot tall'.

Explanation:
When a number and noun combine as an adjective, the noun is singular: 'a ten-rupee note'.

Explanation:
Greek origin words: 'phenomenon' (singular) -> 'phenomena' (plural).