Why sometimes there is a proposition before "next"/"last"/"this"/"that"+"time word" ?

Question

Inspired by the course, I happened to find a question about English grammar. When listening to TED, I noticed that the speaker said “survive to this day”. However, there exists a rule that “if we use next/this/that/every to modify a “time verb” like “week” “day”, we don’t need to add a prepositional word before it. Therefore, it occurred me why sometimes the preposition should be omitted but sometimes not.

Answer 1

The use of 'to this day' is different from 'temporal adverbs' such as 'He came home yesterday or next week'.

Here 'this day' is just a temporal 'noun' that can follow a preposition. 

Similar examples:

He won't come back until next week. 

The meeting is posponed to next Tuesay.

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