Xintong Tiandi Technology applied for the trademark in 2007; the application made in China by Apple, which makes the iPhone, was not approved until 2013. 请问：(1) which 引导的定语从句的先行词是？(2) 后面一句的主句是 the application was not approved 吗？
在含有since的时间状语从句中的主要分句能用一般过去时和用完成时有什么含义的不同？The annual assembly was held
outside the Chinese mainland for the first time since its establishment in 2018.与主句改成现在完成时有什么具体语义上的不同？
The physicist has made a discovery , which I think is of great importance to the progress of science and technology. 为什么which 引导的非限制性定语从句中会出现think 和 is 两个谓语 ，想通过句子结构分析了解为何会存在两个谓语。
...rather than the lasagnas, tofu and other products that shoppers often buy. Where research has focused on consumer products, it has usually been for a small number of them.请教老师：粗体字句子句首词where在文中的的语法作用。
Up Broadway he turned, and halted at a glittering café, where are gathered together nightly the choicest products of the grape, the silkworm and the protoplasm.他拐到百老汇路，在一家灯火辉煌的餐馆门前停了下来，每天晚上，这里汇集着葡萄、蚕丝与原生质的最...
A judge agreed to postpone a hearing in which the FBI was seeking to force Apple to help unlock an iPhone used by a dead terrorist.请问：如何理解句中的 in？in which 在这句中可以换成 where 吗？
...happened, he would not mind. (=Whatever happened, he would not mind.)让步状语从句的连接词是no matter what,还是no matter？可以认为what happened是一个名词性从句，而no matter是一个名词性的让步状语从句连接词吗？whatever happened可以认为是一个名词性...
... the expense of technology or vice versa 【主语从句】//often【频度状语】 //depends on【谓语动词】// the issue of which is seen as the driving force.【宾语】在该句中，最后这部分，of which…force做the issue的后置定语，which为宾语从句连接代词，of表示...