正好

The adverb “正好”is used as an adverbial, meaning “just; just in time ”or “happens to ”. It may be placed before the subject, for example,
山楂正好治这种病。
我们刚到公共汽车站，正好来了一辆车。
他送给我的这双旅游鞋正好合适。
这本书正好一百页。
他要找经理，正好经理回来了。
When used as an adjective, “ 正好” often functions as the predicate or the complement, meaning “just right; just enough; just in time”, for example,
你给我的钱正好，不多不少。
你来得正好。