"it looked as if it was on fire."的意思?

it looked as if it was on fire.的意思? It looked as if he had understood this question.的语法为什么是It looked as if ,而不是It is looked as if it looked as if it were going to rain 这里的looked表被动吗 为什么it seems as if=it looked as if而不是looks为什么是looked不是looks It looked as if it was going to rain.请问为什么不能在as前加上一个that? It seemed as if... 请问这句用As if引导的虚拟语气从句有错吗谢谢It looked as if it's going to rain为什么主句是过去式 the tree looked as if it ______for a long time怎么选hadn't been watered 3Q He looked back at the whisperers as if he wanted to say something to them,but thought better of it that tree looked as if it hadn't been watered for a long time这里的as if是不是表示虚拟?不是的话,是表示的什么? that tree looked as if it hadn't been watered for a long time这里的as if是不是表示虚拟? that tree looked as if it hadn't been watered for a long time.是虚拟语气么?由if 引导的?那主句是什么? 问一下这个AS IF 的句子It looked as if it had fallen on the floor 请问这是事实 还是虚拟 如果两者调换一下应该怎么改 help me translate thisIn the run-up to the event,it looked as if this might be overshadowed by squabbles over America’s internet hegemony Life if it is only as it looks as if she 's It’s as if they were 帮我修改一段英语剧本,旁白：Although Snow White had been dead a long,long time.She looked as if she was living.She looked as white as snow,as red as rose and as black as ebony.However,one day,it happened a prince came to the seven dwarfs