前面有人提问since this year 的说法有没错误。
https://www.cpsenglish.com/question/55217
我赞同好题老师的剖析。但有趣的是，我在王国栋编著的高校英语选修课系列教程《大学英语深层语法》（清华大学出版社）的535页发现了since now的说法，我觉得这个表达与 since this year 的性质是一样的，不妥，甚至错误。想听听各位专家和网友的怎么看。
我在COCA语料库中查了一下，since now共有123例（除since now外也有since now that等搭配）。但我没在正式出版的语法著作中发现类似使用方法。个人感觉应该改用from now , from thisyear 才是适合的。
同意邹老师的剖析。正如你所说，since this year 和since now 的性质是一样的。容易见到词典对since的讲解为：from a particulartime or event in the past until the present, or in that period of time.（朗文），since 后一般接过去的时间点或段。
我查了海外的一个英语平台，解答人是如此说的：
“Since” can only be used when starting at a point in thepast, that discounts the present. You can say “I’ve been doing since lastTuesday” or “I’ve been doing since 1999”, because those are both solidly in thepast. However, “I’ve been doing since 2020” is currently incorrect, as 2020includes the present moment. You could also say “I’ve been doing since thisspring” as it’s no longer spring now. Informally, people sometimes do use “since”to refer to times that start in “the present.”
https://ell.stackexchange.com/questions/255141/present-perfect-since-this-year-this-summer
关于since now 的使用方法,我查了COCA共123例子，但这里包含很多的since的连词使用方法，只是since 和now比邻而已，如：
There is a lot of competition with other designers since now everyoneis doing this type of art.
介词使用方法占少数。如：
1. Since when do you care? Since now.
2. Since now, some disk-scheduling algorithms have been proposed toschedule real-time disk requests.
甚至可以用since +以后时间
1. Since when do you cook? Since tomorrow.
2. Since tomorrow we won’t have a home anymore.
显然这类是在特定语境中的口语表达，应该是非正式使用方法，虽然也不可以说是错误。
因此，你提到的《大学英语深层语法》的例子列出since now, 也不可以算错。若是正式文体或考试，还是不要如此用，正如你所说，改用from now on的形式。
