The word 'gonna' is incorrect grammatically. The equivalent in proper grammar would be 'going to.' When using the word 'gonna' you are telling someone what you are planning to do at that moment or in the near future. 'gonna'这个词是不正确的语法，它相当于正确语法中的'going to'，当用'gonna'这个词的时候，就是在告诉别人你在那个时候或者在不久的将来马上要做什么。

Here are some examples: 这里有一些例子： 

"I'm gonna have some coffee." 

我马上要去喝点咖啡。

"I'm gonna go to work."

 我马上要去工作了。

"I'm gonna eat some cake."

 我马上要去吃一点蛋糕。

"I'm gonna send out my resume."

 我马上去发简历。

"I'm gonna run a marathon."

 我马上要去跑马拉松了。

"I'm gonna ask her out for dinner."

 我马上要叫她出去吃晚餐。

"I'm gonna stop smoking."

 我马上要戒烟了。

"I'm gonna help my friends." 

我马上要去帮我的朋友。

"I'm gonna take swim lessons."

 我马上要去上游泳课了。

"I'm gonna read a book." 

我马上要去读一本书。