书上都说that引导名词性从句时没有任何含义，但是在下面这句中that表示“是否”的意思：He looked in the glass to check that his tie was straight. 他对着镜子看领带是否系正。请问：这个that用得对吗？这个that可以换成if或whether吗？
这是网上对美国浪漫主义作家惠特曼的介绍：Walter "Walt" was an American poet, essayist and journalist. A humanist, he was a part of the transition between transcendentalism and realism, incorporating both views in his works.请问：A humanist 前面是否少了as？
As pace of life quickens things tend to change fast in the city.1) Pace of life 前需要冠词a或the吗？2) As在此是连词，意思是“随着”还是“因为”？还是两者皆可？3) quicken things 两词之间需要加逗号吗？有无逗号有何区别？
That means all rural residents living below the current poverty line should be lifted out of poverty by 2020. It will be the first time in China's history that extreme poverty is eliminated.学生认为that extreme poverty is eliminated应该用现在完成时态，对吗？
The British are not familiar with different cultures and other ways of doing things, as is often the case in other countries. as指代的是主句中的not not familiar with different cultures and other ways of doing things这一部分吗？从句中缺的是主语，这个部分如何作主语...
... I realize that the bond between members of a chimp family is as strong as in a human family.1. as strong as 第一个as 为副词第二个as 为连词对吗？2. 第二个as 做连词的时候 一定是连接从句吗？如果是从句 那这句话第二个as 省略的内容是什么呢？
例句：Spain's NBA champion Marc Gasol was his team's top scorer, the Toronto Raptors star hitting 33 points in the comeback victory, while point guard Ricky Rubio contributed 12 assists.问题：在本句中，while从句修饰哪项内容/成分？
RD上看到一句话：Here was this tall fellow all curled up, holding that sleeping boy in his arms as tender as if he were his little brother.此处的tender 应该修饰动词hold, 所以应该是副词，因此应该为tenderly, 请问对吗？