If he doesn't want to be involved, then so be it.

要是他不想参与，那就随他的便好了。

《牛津词典》

If so, then a new alarm clock could be just for you.

如果是这样的话，那么一个新的闹钟可能比较适合你。

youdao

We don't actually need it on Tuesday, but if it arrives by then, so much the better.

实际上我们星期二并不需要它，但如果那时能到就更好。

《牛津词典》

She knew then that if another black woman could play the piano so could she.

VOA: special.2009.01.18

So, what we do as our seventh step is then figure out if we have any extra valence electrons left at all.

那么，第七步要做的是看看,我们还有没有剩下的价电子。

麻省理工公开课 - 化学原理课程节选

If so, then from an evolutionary standpoint any kindness towards an animal that an animal shows towards another animal--is a mystery.

如果这样，从进化论观点看,任何对动物善意行为,一个动物对另一个动物，是个谜团。

耶鲁公开课 - 心理学导论课程节选

However, what the WSJ then points out is that if this were so then those funds investing in those inefficient markets should be beating the general market: and while certain funds do do so, no class of funds does so regularly.

FORBES: Investing in Inefficient Markets and the Efficient Markets Hypothesis

If they get relegated then so be it but, if they are sensible with their money, what happens next is that instead of having one good year in 10 in the Championship, they might have five good years in 10 and get back in the top flight again.

BBC: Ask Steve Claridge

So, then: what if a paid professional became so good at that supposedly most difficult of all things hitting a pitched baseball that no one else really wanted to play against him?

NEWYORKER: King of Walks