The word 'It's' is a contraction of the words 'it is.' When stating 'my turn' you are telling someone that it is time to change position or position focuses on to you.

'It's'这个词是'it is'的缩写形式，当提到'my turn'的时候就是告诉别人是时候改变位置或者轮到你了。

Here are some examples: 这里有一些例子： 

"It's my turn to walk you home."

 轮到我送你回家了。

"It's my turn to do laundry."

 轮到我洗衣服了。

"It's my turn to work late." 轮到我加班了。

"It's my turn to take out the trash."

  轮到我扔垃圾了。

"It's my turn to choose where we eat."

 轮到我选择去哪吃了。

"It is my turn to pay for dinner." 

轮到我为晚餐买单了。

"It is my turn to roll the dice." 

轮到我掷骰子了。

"It is my turn to provide an answer."

 轮到我提供答案了。

"It is my turn to try and play the game."

 轮到我试着玩这个游戏了。

"It is my turn to attempt solving the problem."

 轮到我尝试解决这个问题了。