英语 look at the clouds ,there is going to be a storm请问这里 为什么要加个be 直接 there is a going to a storm 不行吗

Look at the ___ (cloud) in the sky.It may rain. Look at the dark cloud,it will rain soon.Well,( )A,maybe B,may be look at the cloud .i think it will raincloud后面要加s吗 They happened to look up at the sky and saw a b___ cloud overhead.首字母填空 They were tired.They happened to look up at the sky and saw a b_________ cloud overhead.“Ah!” 意 Look at that dark cloud.It looks like rain. 英语小短文《Look at the sky 》 查字典英语是look at the dictionary what does the cloud look like?what（）the cloud（）? The cloud ___(look) like a rabbit 填空 Look at the ________(cloud)in the sky.It may rain.请说明理由,我知道答案是clouds,但是晕不是不可数的吗? look at the cloud.it seems that it will rain soon的同意句转换变seems that it will只有2个空 Look at the cloud,it __ that it is going to rain soon.A.seems B.seemed选择A还是B Look at the cloud!It ________ a lovely sheep.这里填空是Looking like还是looks like,我觉得都可以啊jijix 英语是see the map 还是look at the map Look At The Sky look at the boy. look at the