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as is often the case 结构︰as/which is often the case (with) 说明︰此句型意为是常有的情形。这是当关系代名词的 as 以全体主要子句当先行词的句型，可以用 which 代替 as. He was late for school， as (which) was often the case with him. 他上学迟到，但这对他而言已是家常便饭了。 As is often the case with old people， my grandfather is fond of talking about good old days. 就像其它老人一样，我祖父也老喜欢讲他当年的故事。 He quarreled with his friends， as was the often the case. 他和朋友吵架，但这已屡见不鲜。 There is no + N + but 结构︰There is no+名词+but 说明︰此句型意为无而不。but 做准关系代名词(既当连接词又做关系代名词用)，相当于who/whom/whichnot。 There is no one but is (=who is not) concerned about his future. 没有人不关心自己的未来。 There is nothing but he can do. (=There is nothing that he cant do.) 没有他做不到的事。 There is no rule but has exceptions. (=There is no rule that doesnt have exceptions.) 每一种规则都有例外。 There is no one but wishes to get somewhere. 没有人不希望将来能有所成就。 | 
