be back的用法看到书上是you are to be back by 9 o'clock那you are back by 9 o'clock可以吗?这里的BACK应该是副词吧?

be back的用法看到书上是you are to be back by 9 o'clock那you are back by 9 o'clock可以吗?这里的BACK应该是副词吧? be back ,come back和go back 的用法区别. be back用法 Hohn will be back (in a minute)对括号内部分提问( ) ( )will JOhn be back最好说下will be的用法开头是John，人名，打错了 请问back.come back.be back在用法上有何区别?它们之间可以互换吗?例如：1.it's september,we are all back at school.2.when did you come back.3.what do you usually come back?4.he will be back in a month.请说明一下这些句子. 英语中的wish用法,是wish you successful还是wish you success如题可是我在一本比较权威性的书上看到的是wish you successful 用英语怎么说“我马上回来”应该说 I WILL BACK SOON 还是说 I WILL BE BACK SOON 按照我们英语中一般将来时的句型应该是第一句,为什么我在书上看到的是第二句啊?第二句的 BE 还是说这是固定形式! You are worth it 查到worth 用法A 主语（物）+be +worth + 名词.B 主语（物）+ be + worth +动名词.1 看到网上有这么写的 You are worth it 这么写句子,语法对么?be worth 后面接 名词,和动名词,这里 it 是代词, He says he will be back two days but he comes back a week.介词的用法after 和in 的区别 ()will your mother be back.A how long B how soon ,并说说这两个特殊疑问词的用法. I'll be back.和I'll come back.这种用法对吗?我会回来的.用英语正确的写法是什么样的?我英盲, I am sad to be here watching you all heading back home 句中watching用法 ___your price is right ,we are going to give you an immediate order.A.SHOULD B.PROVIDED选哪个?A 我在课本上也看到用A的句子 书上有一句是这样的SHOULD ANY DAMAGE BE OCCUR...... (a,在高数书上看到的 the drug proved to be of noticeable side effects.这是病句吗?这里有个成分是be+of+adj.因为noticeable是adj,但是正确的用法应该是be+of+n表示该名词的形容词；这句话是从书上看到的,大家认为ieshi病句吗? will be中be的用法Jack will be back in a few minutes这句话语法正确么?如果写成Jack will back in a few minutes可以么? be back later的意思see you是“的意思”的意思吗? be good at后面跟的是ing形式还是过去分词?今天在教辅书上看到一题,Thinking back on the past years ,I worked so hard at English , so I am good at sopken English now .这是不是错的?be good at 后面不是要跟ing形式吗