注意：it强调句型不能强调句子的谓语。

二、not…until结构强调句型的构成：

It be not until部分 that 句子的其他部分。

例如：

He didn''t go to bed until his father came back..

变为强调句型为：

It was not until his father came back that he went to bed.注意原句中的didn''t go部分中的not提前后，剩下did go变为went.

本文开头提到的两个句子都是not..until结构用于强调句型。那么把这两句话变回正常的语序则为：

1)…but he didn''t make his most important discovery until after the war.

2)The importance of Fleming''s discovery was not fully recognized until World War II.