对于定语从句这一块,大部分同学对于基本的which, who, that引导的从句并不陌生,但是对于what这个词,大部分老师都会说what不能引导定语从句。跨考教育英语教研室彭佳洁老师提醒大家,只能说它不是一般的定从,而是一个先行词和关系代词的结合体,因此关于what引导的定语从句,前面本身都不应该再出现先行词。换句话说,如果句中已有先行词,就一定不能用what引导。比如错句:You can have everything what you like. 这里中what该词前已经有了先行词everything,所以不能用what引导。<br>另一句:Those activities became what he calls “electronic heroin”。这句中what在从句中作谓语calls的宾语,或者更具体的是充当宾语补足语,而这个what相当于the activities that,即一个先行词和关系代词的结合体。但是另从结构上来说,what从句是充当became的表语,也就是相当于名词从句中的表语从句。所以该句既可看做是what引导的特殊定语从句,又可充当名词性从句。
You may go, only come back early. (only =but)你可以走,但要早点回来。<br>He wants to buy the watch, only he can’t afford it.他想买这块表,但他买不起。<br>注5:however释义<br>adv.无论如何;不管怎样 However hard it may be, do your best.<br>adv.尽管如此;然而 Later, however, he decided to go.<br>adv. (表示惊奇)怎样;怎么 However did you find it?你是怎样找到它的?<br>conj.不管怎样;不管用什么方法 He can go however be like.他想怎么去都行。<br>2、whereas与while的区别<br>1.whereas = while<br>while前后句子之结构要求并列相对,whereas 在结构上则不一定不需要严格平行。(OG12-131)<br>whereas/while这种连词连接的比较成分不要求含义上绝对的平行<br>2.whereas连接的平行比较只要求对比的核心逻辑上有对称关系,不要求对称位置必须是对称名词,下面句子中主从句的主语分别是energy和nuclear power并不是对称名词,但是对比的核心都是“核能发电占总产出能量的份额”,如OG12-131:<br>Over 75 percent of the energy produced in France derives from nuclear power, whereas nuclear power accounts for just over 33 percent of the energy produced in Germany.<br>*:<br>但是如果whereas后面接介词短语,那么主句的开头也必须需要是介词短语(whereas后出现介词短语或者状语都会非常对称)如OG-113:<br>Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes fo