Let’s learn some adjectives today. There are 2 kinds of adjectives. The な adjectives and the い adjectives.
For い adjectives
あつい、熱い warm, hot
さむい、寒い cold (use to describe weather only)
As you can see that for the い adjectives, there is an い sound at the end. That is why its call the い adjective. So let’s make a negative adjective.
あつい becomes あつくない(not warm or not hot)
さむい becomes さむくない (not cold)
What can you tell? The い becomes くない. Difficult? Not really. This is the rule. So remember it well. 
For な adjectives
きれい、綺麗（な） (pretty)
かんたん、簡単（な） (simple, easy)
What about the な adjectives? As you can see that I’ve made brackets on the な adjective. If you want to describe something pretty. Just add な after it. Here are two examples.
きれいな ふく です (A pretty dress.)
きれいな おんな の こ です (A pretty girl)
Just in case you didn’t know. おんな の こ means girl. But let me break up this for you. This is not exactly a word. おんな、女 means female and こ、子 means child. And the の is to show ownership. So you can see from here it literally means “female child” which also means “a girl”. As for boy, おとこ の こ、男の子.
So how do we make it into a negative form? Just simply add a じゃない after it.
Like this->きれいじゃない(not pretty) And for かんたん, it becomes かんたんじゃない(not simple)
Or you can add a -dewanaiではない too. So, きれいではない and かんたんではない has the same meaning as the above.
That’s all for today’s post. In the next post, I will teach on how to change the adjectives to become past tense, and negative past tense.
Till then, have fun learning Japanese
がんばって！
