1.Some economics argue that powerful structural changes in the world have up-ended the old economics models that were based upon the historical link between growth and inflation.
1)第一步通過動詞找謂語:argue、have up-ended、were based upon。這里有三個動詞,因此可以推出,該句不是簡單句,而且有兩個連詞。
2)第二步找連詞:兩個that。謂語have up-ended在從句“that powerful ...have up-ended...models...”中;謂語were based upon在從句“that were based upon...and inflation.”中,因此可以推出主句的謂語是argue。
3)第三步判定從句前的詞性。第一個that從句:that powerful ...have up-ended...models...在及物動詞argue之后,因此是賓語從句;第二that從句在名詞models之后,因此that從句可能是同位語從句或者定語從句,就得看that在從句中是否作成分,很明顯that在從句中作主語,因此第二個that從句是定語從句,修飾限定名詞models。因此可以推出該句的主句是:Some economics argue that powerful structural changes in the world have up-ended the old economics models。