同义句转换:If we had not missed the train,we could have seen him

你还!这个空应该填 his return.
先来看一下return这个词：
return v.回转,返回；复发,又来；送还；言归正传 n.归来,返乡；来回,汇成；赢利；统计表
因此return既可以当动词,又可以做名词.
If we had not missed the train,we could have seen him since his return 整句话是个虚拟语气,整句话的意思是：如果我们没有错过火车的话,他一回来我们就能看到他.而实际上他们错过火车了.
书山有路勤为径,学海无涯苦作舟

His arrival

填写his return