... sit down, sign up for all my classes, get into them, and I'm happy.我的疑问:sign 是不及物动词为什么不直接用 sign for, 而一定要加上副词 up 呢?问题之二:And it remains to be seen whether large numbers of younger, healthier Americans will sign up for coverage.我...
曹老师您好在您回答的问题http://ask.yygrammar.com/q-34377.html当中您认为在句子I have no choice but to leave,您认为but是个介词。对此我想谈些我的想法,请您指正。我认为but在此可以看作是从属连词。他是句子I have no choice but (that)I sho...
In the past year, however, software companies have developed tools that allow companies to “push” information directly out to consumers, transmitting marketing messages directly to targeted customers.请问:transmitting的逻辑主语是?
The problem is that catalysts and membranes have been expensive until recently.请问这里catalysts and membranes是最近才开始变贵,还是从以前到最近一直都是这么贵,还是说以前一直贵,但最近不贵了?还请教 until recently 是否有多种不同的用法?