前面用冠詞the或者a,例如:
1、We stopped for a picnic en route.我們在途中停下來野餐。
2、We had a picnic beside the river.我們在河邊野餐。
3、He is ill, so he didn't take part in the picnic.他病了,所以沒參加這次野餐。
4、She was keen on going to the picnic.她很想參加這次野餐。