[M2]Use of English - Key word transformation

would rather　B1レベル。こんなんでよくFCE受かったな。

We wanted to continue
-> We would like to have continued
Collinsではwould like は米語だった
Cambridgeは、Would you like..? I'd like to.とか

I wanted to stay
-> I would sooner have stayed

would sooner do it = would rather do it = would prefer to do it
Cambridgeを見るとwould rather is more commonとあった

Didn't you want me to tell...?
-> Would you rather I hadn't told...?
疑問、否定、過去、「異なる主語」の組み合わせ。無理すぎる。

would ratherの基本。「異なる主語」の場合は動詞が過去形になる。
would rather do
[same subject] I’d rather stay at home tonight.
[different subject] I’d rather you stayed at home tonight.

would rather not do
[same subject]I’d rather not go out tonight.
[different subject]I’d rather you didn’t go out tonight

Would rather, would sooner
https://dictionary.cambridge.org/grammar/british-grammar/would-rather-would-sooner
Cambridge dictionaryは文法の説明がわかりやすいかも。