Learn English – Is “loose motion” a synonym of “diarrhea”

The idiomatic phrase is "and so forth" which is often also used as a part of the phrase "and so on and so forth". It is, IMO, an elided form of "(and so it goes on) and so it goes forth".

While "and such forth" appears to be reasonably commonly used (going by Google's results), this ngram suggests that it is at best a colloquialism or a dialectal peculiarity and at worst, a common error.

To answer the question in the title, I'd say that and such forth should never be used. The phrase and so forth should be preferred instead.

If you're speaking on Tuesday about something that happened on Monday, it's yesterday.

If you want to be more specific, you can say yesterday morning, yesterday afternoon, yesterday evening. The exception here is that native speakers almost never say ?yesterday night - it's invariably last night (and conversely, we don't say ?last morning/afternoon/evening).

(Edit) Thanks to Talia for pointing out that US speakers actually prefer last evening over yesterday evening. As a Brit I find that odd, but at least we all agree last doesn't work for morning/evening.

If you're talking some time later (say, Friday) about what you did Tuesday, and you want to refer back to earlier events on Monday you can't use either yesterday or last, because they always mean the day before the day on which you are speaking (not ...the day of which you are speaking). You have to use alternatives such as...

"On Tuesday I slept through my alarm because I'd stayed up late the previous/preceding evening".
(or "...the evening/night before").