"Vous buvez du thé froid ?"
In French, most adjectives are placed after the noun.
Certain adjectives are placed before the noun, some which you can memorize with the acronym "BANGS":
Beauty - Age - Numbers - Good and bad - Size (except for grand with people)
These descriptors - and a few others - are considered inherent qualities of the noun: For example "une jolie fille" for "a pretty girl"
Please also have a look at the following link: http://french.about.com/od/grammar/a/adjectives_4.htm
In French, there are 3 ways to ask a question:
1) Most formal: when the verb and the subject are inverted (the verb is in first position)
Boit-il (...) ? = "Does he drink/Is he drinking?"
Here, you have to put a hyphen between the verb and the subject in French.
2) Less formal: when the subject is in first position and the verb in second position
Il boit (...) ? = He drinks/He is drinking?"
3) Idiomatic phrase: "Est-ce que" (literally "Is it that"), or "Est-ce qu'" (before a vowel)
Est-ce qu'il boit (...) ? = "Does he drink/Is he drinking?"