While
historically, the speed at which information moved was slower
than current times, firms still valued customer loyalty.请教各位老师，while historically, 这是分句一个省略句吗？
老师说，but与however都可表示转折，其中一个简单的区别就是，however后面要有逗号，而but后面不能用逗号。但是，看到了下面这个句子，but后却用了逗号：
But, three days later, a letter arrived, calling me to Groydon for an interview with the he...
Esteem adds to respect the implications of a high valuation with a consequent prizing and of warmth of feeling or attachment. 本句中and 和or并列的对象分别是谁？修饰关系如何？
Yet he could not tell anyone about his theory as the powerful Christian Church would have punished him for even suggesting such an idea.本句出自人教版高中英语教材必修五的Unit 1。请老师分析一下句中 would have punished 的用法。谢谢！
My mother was at a meeting, so if I had questions, there would be no one to _______.A. ask B. answer学生认为AB两个答案都可以。不定式的动作ask和one可以是被动,to answer和one是主动关系，answer可以是不及物动词。请专家老师解惑。