outdoor activity什么时候用单数什么时候用复数

outdoor activity什么时候用单数什么时候用复数 outdoor activity是不是动词,那activity呢? My favourite indoor/outdoor activity 英语作文An interesting Outdoor Activity my indoor,outdoor activity 英语作文 flying ( )is my favourite outdoor activity(kite) 英语翻译[ ] [ ] [ ] a very popular outdoor activity. outdoor 什么时候加s,什么时候不加? activity什么时候变activities Fishing of my favorite outdoor activity...续写!请求 一篇an outdoor activity的英语作文快 我着急 My favorite outdoor activity（至少50字） That's my--------outdoor activity中间该填什么? 将is,playing,my,football,activity,favourte,outdoor连成一句话. what outdoor activity do you want to try?同义句what outdoor activity ___ ___ ____ ___ try? outdoor outdoor什么时候该加上s 什么时候不该加上s 英语作文：My favorite outdoor activity（至少40字）最好别多于40字