"to; toward"    对 (Prep.)

对 here is followed by a noun or noun phrase to make a prepositional phrase, and this phrase is placed before a verb or an adjective phrase to express attitude or frame of mind towards someone or something.

Subj. + 对+ N + VP/AP

Example:
1. 王先生对人很友善。
Mr. Wang is very friendly toward people.
2. 他对中国市场很感兴趣。
He is very interested in Chinese markets.

Substitutive drills:

   大卫       对        自由市场特别感兴趣。
  王老板    对        美国商品很了解。
  张经理    对        个体户的情况知道很得很少。
  李小姐    对        高档货没有兴趣。