46． if at all是一个由if引起的主谓结构不完整的短句结为即将……，即使……等。
i can see only with great difficulty, if at all. 47． 由there引起的句型容易产生复杂的句子结构.
there have been opened up to the vast and excellent science, in which my work is the beginning, ways and means by which other minds more accurate than wine will explore its remote corners. 48． range from …to…结构。这是一个常见结构，译时很多情况下应变通处理，不能完全依靠辞典上的释义。
computer applications range from an assembly line completely run by computers to a children toy responding to remote signals. 49． the way…结构
i always thought she was a common-sense person who discussed things the way they ought to be discussed. 50． 复杂宾补结构
in recent years, the development of sensitive and accurate measuring equipment has made it possible to measure the acuity of hearing of any individual at different frequencies. 51． 某些分隔结构
1） 动词短语相关部分被分隔（当make use of ，take notice of，pay attention to，
等动词短语变成被动语态时）。
use is made of solar energy in heating houses.
2）双重定语引起的分隔。
but there is of culture another view, in which not solely the scientific passion, the sheer desire to see things as they are, natural and proper in an intelligent being, appears as the ground of it. 52． to be doing…when…是一个句型，多译为某人正在做……时，突然……。在简单的句子中容易看出，一旦句子变得复杂一些，可能就不太容易识别这种句型。
she said she and a friend had gone out to dinner that night, and were walking home together at about 10 o’clock, when a very big, very tall man, accosted them and demanded their purses. 53． too…to句型