一个简单的英语语法问题The boys___an apple 用have还是has

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• 一个简单的英语语法My father has been at rest since I was a girl.在我还是小女孩时,我父亲就已去世了.在这句话中为什么后面since I was a girl前面还用现在时,能这样用吗,不懂,请讲讲,
• 一个简单的英语语法问题The boys___an apple 用have还是has
• Has all that can be done been done?为什么用HAS 不用 HAVE PEOPLE也是整体,动词用复数先换成陈述句＝all that can be done has been done主语＝all 定语＝that can be done谓语＝has been done（被动）转换成简单的主句＝all has been doneall 作为一个整体,集合名词所以用单数我的意思是为什么用HAS 不用 HAVE PEOPLE也是整体，动词用复数 that为主语的话，无论that指的是单数还是复数，谓语动词都要用单数？
• 关于英语语法和翻译的问题麻烦大家帮我解答下：1.我假设它一个苹果.是 I assume it is a apple. 还是 it is a apple that I assume.2 我假设这东西是一个苹果. 能不能说 this stuff is a apple that I assume,还有其他别的翻译吗?（不要直接翻译.2.加州阳光是 california sunshine 还是 sunshine of california 是不是两个都是名词 中间就加of? 还有请问of 在什么时候用最适合?加州阳光是第3个问题,上面标识错了.抱歉.
• SAT语法问题 1.SAT语法中两个句子通过逗号连接,中间没有连词行吗?如 The delegates has come so far,they did not want to come back without finishing sth.2.冒号在SAT中怎么用?是类似中文里面的解释说明前一句还是有什么别的用法?3.Harry became the first woman to have piloted a plane across the English Channel and did it just nine years after the Wright brother's first powered flight.这句话里面有两个问题要问首先to have pliloted 这个事情是发生在主句动作之前的 应该没错的吧?再者就是SAT 中IT能不能指代一件事情（to have piloted a plane）?还是仅仅只能指代一个名词?我们老师一直都说可以的 但是我看到网上很多人说都是不
• 关于动词用法小弟想请教下,比如说学到一个单词是动词,什么情况下用不需要加系动词的陈述句,什么情况需要用加系动词的陈述句,什么情况用加助动词的疑问句,什么情况又不用呢?总之小弟现在写作文尤其是陈述句不知道跟在主语后面是was还是have,或者还是直接用动词做谓语.真心求教了!困惑小弟很久了…例如这个句子 the virus agent was not known until a doctor found it by chance.而不能用 the virus agent was nov known until a doctor has found it by chance.这两句就差了个has,为什么正确的句子没有has呢?就类似于这样问题.能给留个qq吗?
• 提问,英语的一些单词、短语、句型用法1、We are all here waiting for Miss Green to come 为什么用to come2、I saw a big dog lying under the tree when walking past the shop为什么不用was walking3、All has been done now.We can go.这里为什么用has?是All为不定代词还是将All看为一个整体还是什么?4、The students were all tired,but none of them stopped to have a rest-Do you want an apple,a banana or a pear?-None,they all look bad为什么用none,不是人和物吗?5、I think he must be in the office now,isn't he?是否情态动词反意疑问句都用be动词?
• 一个简单的英语语法My father has been at rest since I was a girl.在我还是小女孩时,我父亲就已去世了.在这句话中为什么后面since I was a girl前面还用现在时,能这样用吗,不懂,请讲讲,
• 英语语法基本类型的相关题目,比如（肯定句、否定句、一般疑问句、特殊疑问句）像这样的找一些.