I often go to the English corner to have a free talk with my classmates ____ I am busy.

问题描述:

I often go to the English corner to have a free talk with my classmates ____ I am busy.

整句话的意思应该是
我经常去英语角与我的同学闲谈__我很忙时
可以填if( 如果 )when( 当 )while( 当 )

so

I often go to the English corner to have a free talk with my classmates _when___ I am busy.