ある参考書に載っていた以下の2つの英文の違いについて尋ねてみました。
If Biden wins the election, Trump will not admit his defeat.
If Biden won the election, Trump would not admit his defeat.
答え
The difference between the two sentences lies in the tense of the verbs used.
The first sentence, "If Biden wins the election, Trump will not admit his defeat,"
is in the present tense.
It suggests that there is a possibility that Biden might win the election
in the future, and if that happens, Trump will not accept the result.
The second sentence, "If Biden won the election, Trump would not admit his defeat,"
is in the past tense.
It suggests a hypothetical scenario where the election has already taken place,
and Biden has won. In this scenario, it is assumed that Trump would not accept the result.
In summary, the first sentence discusses a future possibility,
while the second sentence discusses a hypothetical situation that has already passed.
また、This problem is difficult to be mentioned in the class.が間違いであることについては、
The sentence is grammatically incorrect because the use of infinitive "to be"
is not appropriate here.
The passive infinitive "to be mentioned" suggests that the problem is not the one
doing the action of "being mentioned" but rather someone or something else.
In this case, the problem itself cannot "be mentioned" because it is an inanimate object.
正しくは、This problem is difficult to mention in the class.としなさいということです。
今後もいろいろと試したくなります。