is my sentence correct?plz

is my sentence correct?plz
我有一个吃惊。

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no, it's not correct.

Should be 我很吃惊。

不可以说“一个”吃惊！！

“吃惊”is not a thing and you cannot count it.

Hope this helps.

is my sentence correct?plz

is my sentence correct?plz
我有一个吃惊。

（我很吃惊）

可以说：我吃了一惊。

is my sentence correct?plz

is my sentence correct?plz
我有一个吃惊。

吃惊is a word just show your feeling.like happy angry.

you can say 我很开心，我很快乐，我很生气。we do not say我有一个开心 ，我有一个愤怒。

 hope i can help you