2つの文の文法性の違い(文構造、文の意味、文の発音)
(4)のaとbの、(5)のaとbそれぞれの文法性の違いが生じる理由について、文構造、文の意味、文の発音の面から説明お願いします。
(4) a. Most embarrassing of all was falling off the stage.
b. *It's unlikely that most embarrassing of all was falling off the stage.
(5) a. Each part, he had examined carefully.
b. *It's impossible that each part he had examined carefully.
回答
ご質問に使われている日本語が分からないので、ご希望に沿えないかもしれませんが、私なりに回答します。
(4) a.
Most embarrassing of all was falling off the stage.
中でも一番恥ずかしかったのは、舞台から落ちたことです。
(4) b.
It's unlikely that most embarrassing of all was falling off the stage.
文法的には正しいですが、分かりにくいです。
例えば、次のようにもっと断定的な表現をします。
Falling off the stage was not the most embarrassing moment.
Falling off the stage was embarrassing, but other incidents were even more embarrassing.
The most embarrassing experience was not falling off the stage.
(5) a.
Each part, he had examined carefully.
正しくは、He had examined each part carefully. ですが、each part を強調するために、文頭に持ってくるというのは、あり得ます。聞く人も理解できます。
(5) b.
It's impossible that each part he had examined carefully.
これは間違っています。
It's impossible that he had examined each part carefully.