請問英文問題： A higher proportion of Americans go on to higher education than is the case in Britain. “ than is the case ”  如何用文法分析解釋，請問是倒裝用法嗎？

在表示「比較」的句子中，than兼具「連接詞」和「代名詞」的功能，因此屬於「準關係代名詞」。這個than 可以是關係子句的「主詞」或「受詞」。

There is more food than is needed.＝食物供過於求。
than是關係子句的主詞。
＝There is more food than (the food that) is needed.

There were fewer people than we had expected.=人比我們預期的少。
than是關係子句的受詞。
= There were fewer people than (the people whom) we had expected.

A higher proportion of Americans go on to higher education than is the case in Britain.這裡的than是關係子句的「主詞」。子句沒有倒裝。
one case: One out of two Americans goes on to higher education.
another case: One out of three British goes on to higher education.
Therefore, the proportion of the first is higher than that of the second.

that, pronoun;
than that of the case=that is used to make the subject(American Hi edu.)specific;
"that" is used when the subject is further away to the subject.

基本文法是
A higher proportion of A... than ...B
由於A的內容不單單是一個主詞，而是一種行為/動作/事件/情況/狀況，所以作者在B的部份不再重覆寫出這行為/動作/事件/情況/狀況的用詞，而改為用the case(直譯:個案/事件)，這裏的case是"go on to higher education；而比較的分別在於"國家"的不同。

其實一般較常見的寫法可以是
A higher proportion of Americans go on to higher education than that in Britain.
同樣文法道理，that是指前文的相同"動作/情況"(go on to higher education)。

請問英文問題： A higher proportion of Americans go on to higher education than is the case in Britain. “ than is the case ”  如何用文法分析解釋，請問是倒裝用法嗎？

☆ higher……than(形容詞+er⋯⋯than，這句不是《倒裝用法》是《比較級》

註解：A higher proportion of Americans go on to higher education than is the case in Britain.

美國人上大學的比例大於英國。
美國人繼續接受高等教育的比例要高於英國的情況。