英语句型分类：五大基本句型(4)

　　9. Jane says science isn't so interesting as music to her. → Jane says science is less interesting than music to her.

　　10. She rides a bicycle more carefully than anyone else in her class. → She is the most careful bicycle rider in her class.

　　【解析】常见的比较等级之间的转换有：①"not so / as+原级+ as"可改为"比较级+ than"；② "not so / as+原级+as"可改为"less+原级(多音节词)+than"；③ "最高级+of / in短语"可改为"比较级+than any other+复数名词 / than any of the others / anyone else / anything else"；④"like...better (than)"可改为"prefer...(to)"。

　　11. The exhibition of children's art began a few days ago. → The exhibition of children's art has been on for a few days.

　　12. My grandpa joined the Party thirty years ago. → My grandpa has been in the Party for thirty years.

　　13. Sam's grandfather died 10 years ago. → Sam's grandfather has been dead for 10 years.

　　【解析】含一般过去时与现在完成时句式之间的转换是很常用的。在现在完成时中，延续性动词与表示一段时间的状语连用，瞬间动词不能。但是，可以用别的方式来表达：①瞬间动词用于"一段时间+ago"的一般过去时的句型中；②瞬间动词可改写成与之相对应的延续性动词及短语，与一段时间连用；③ 瞬间动词用于"It is +一段时间+since+一般过去时"的句型中；④瞬间动词用于"Some time + has / have passed + since + 一般过去时"的句型中。另外，将来时"be going to"结构与"will / shall"结构的转换；进行时(如come , go动词)可与将来时的转换。