If not for John, Brian wouldn't have learned the truth.

要不是约翰，布莱恩不会了解真相。

《柯林斯英汉双解大词典》

This would have been the 70th birthday year for John if only he was here. But people are not questioning if he is here or not.

如果他还健在的话，今天便是他70岁的生日了，但是我们都知道他已经不在了。

youdao

If not for the message (this was about John Lennon's son), then for the memory you have of the very first time you heard this song.

如果没有这条消息(这是关于约翰·列侬儿子的)，在你的记忆中可能最先听到的是这首歌。

youdao

If not, John Kerry and John Edwards are your team for the future.

CNN: Clinton: Time again to choose a more perfect union

Mr Volker, who now runs the McCain Institute on behalf of the former presidential candidate John McCain, said Scotland may not have to reapply for membership if, for example, it chose to share its defence with the rest of the UK, in the same way as Mr Salmond wishes to share a currency.

BBC: Scotland politics