look sad 这里的look有没有进行时

look sad 这里的look有没有进行时 You look sad.(对sad进行提问) You look sad today.是什么意思? You look sad today 意思 look有没有过去式啊? 请教“Look out,there comes abus”这里的look 有首好听的女声英文歌曲,好象高潮是:I look look look 重复好几遍.有知道的告诉下歌名谢谢I look look look I look look look I look look look 看这个 是look this 还是look at this?这里的look是及物还是不及物动词? 有谁知道look over,look aftrer,look for,look out的意思 she ＿（look) very sad today 将You look sad作肯定回答 half-sad look什么意思?如题 look look! look look look look.