I read [somewhere](https://japanese.stackexchange.com/questions/13127/why-
does-%E5%A5%BD%E3%81%8D-use-%E3%81%AA/13145#13145) that 形容動詞 are a special
subclass of nouns. Contrarily 形容詞, the い adjectives, are actually a lot more
similar to verbs. During the time that I have been learning Japanese language
(almost a year) I have developed the notion that verb is an essential part of
a complete sentence and な-adjective can not fullfill the duty of the verb.
Yet, In [The essence of sentence
construction](http://www.guidetojapanese.org/blog/2009/05/18/the-essence-of-
sentence-construction/) on Tae Kim's Blog, the part about **Treating verb
phrases as nouns** , in order to make a sentence, な-adjective is used as a
substitute for verb and だ comes after that only "If you don’t want to sound
girly". In this example on Tae Kim's Blog

> たくさん運動するのはいいが、 **ちゃんと休むのも大切。**

is being treated as a complete sentence and then we read:

> Finally, let’s add a bit of motherly advice-sounding nuance to it and give
> it a more conversation style, since it sounds like the speaker is trying to
> admonish the listener.
>
> たくさん運動するのはいいけど、ちゃんと休むのも大切よ。
>
> If you don’t want to sound girly, you’ll want to add 「だ」 when using 「よ」 with
> nouns/na-adjectives.
>
> たくさん運動するのはいいけど、ちゃんと休むのも大切だよ。

My question is that, in order to make a complete sentence , 大切 being a
な-adjective, **why it is not necessary** for a verb to come after it?
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grammar verbs na-adjectives
Verb after な-adjective, is it necessary to complete the sentence?
I may be misunderstanding your question but I don't think a verb is always
necessary after なadjective. In this case, you can think of it that there is a
be-verb and sometimes the be-verb is hidden.

This sentence is omitting the be-verb and it means "It's good to exercise a
lot but taking a break is also important".

> たくさん運動するのはいいが、ちゃんと休むのも大切。

The be-verb for this sentence could be

> たくさん運動するのはいいが、ちゃんと休むのも大切 **です** 。(formal)

or

> たくさん運動するのはいいが、ちゃんと休むのも大切 **だ** 。(casual)

The `よ` is just a post positional particle, not a verb. You can look up 終助詞
for more explanation on this. In short, it kind of adds a little more nuances
to the sentence.
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answer