The adverb and adjective 正好
正好 most often is used as an adverb. But it also can be used as an adjective and as a part of the state complement.
The adverb 正好
The adverb 正好 
is used to express coincidence. It should be placed before the verb.
is used to express coincidence. It should be placed before the verb.Scheme
正好
verb
Examples
我也正好要去那边，一起去吧！
I was just about to go there too. Let's go together!
wǒ yě zhènghǎo yào qù nàbiān, yìqǐ qù ba
我正好在超市，要什么吗？
I'm in the supermarket right now. Do you need anything?
wǒ zhènghǎo zài chāoshì, yào shénme ma
The adjective 正好
正好 also can be an adjective. If it acts as an attribute in a sentence, and it must be followed by the particle 的 and a noun.
and a noun.Scheme
正好
的
noun
Examples
现在正是这些花开得正好的时候
It’s exactly the right time for these flowers to bloom
xiànzài zhèng shì zhèxiē huā kāi de zhènghǎo de shíhòu
正好 as a part of the state complement
In some cases, 正好 can be a part of the state complement. In these cases, it comes after the verb and the particle 得 .
.Scheme
verb
得
正好
Examples
你来得正好
You came just in time
nǐ lái de zhènghǎo
我们把节日排得正好在他休息的时候
We planned the party in conjunction with his time off from work
wǒmen bǎ jiérì ānpái de zhènghǎo zài tā xiūxi de shíhou
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