此句中been是什么意思,省去意思有什么不同?Thanks for your help; it's been very valuable

此句中been是什么意思,省去意思有什么不同?Thanks for your help; it's been very valuable 有没有说I have been American for three years.如果有为什么可以省去介词to You must have been driving at seven miles an hour句中的must have been driving是一种什么语法及此句的汉语意思 虚拟语气中,什么情况下should可以省去 在虚拟语气中,什么情况下should可以省去 he has been away from the school for many years .中”from”可以省去吗?为什么? i wish i had not been reading什么意思My hair is too short!I wish i had not been reading.这句中的reading是什么意思 同此国殇,什么意思?国殇是什么意思 王明阳“格”院子里的竹子的错误在于什么?“格”在此句中是什么意思? 英语语法How long does it take you to get to school? 此句中“it”是什么用法?有什么意思?什么意义? 天下不多管仲之贤,而多鲍叔能知人也.此句中“多”什么意思? “had never been so pleased”里的been是什么意思?在句子中有什么意义been在句中是作be的过去分词,还是与never连用组成词组? I'll be up/down to see you tomorrow. 什么意思?up/down在此句中什么意思? He must be as strong as a bull.此句中as的用法as...as可否用the same as替换?如 He must be the same strong as a bull第一个as是不是可以省去?如 He must be strong as a bull省去的话,是不是as由之前的连词变成了副词?求 Wandering has always been 请翻译一下.Wandering has always been 这个句子是什么意思? always been 什么意思?wandering has always been, and still is.小说中翻译为：周游世界,无论过去还是现在,. 这里的disabled是什么意思?to discuss goals for helping the country's disabled 此句中的disabled什么意思? spots help to build our bodies and make us strong .此句中的动词不定式to能省去吗?像helpsb (to)do sth一样省去to,还有此句中的and能换成to Wei Ming has been all over China by plane.此句中has been 后为什么没有to?