Where is the word thus supposed to be in a sentence?

Answer 1

The word thus precedes the causal phrase (or follows the conjunction and) in a compound sentence, or comes at the start of a sentence if it refers to a cause in a preceding sentence.

(Thus means "so" or "therefore." The phrase thus far simply means "so far.")

Examples:

"The Roman Empire became fiscally unstable, thus it fell."

"Flat screen TV's were lighter and sharper, and thus many consumers purchased these new versions."

"The company was losing market share. Thus the Xbox 360 was introduced."

"Thus far, no lifeforms have been found on other planets."

"The new system has not had any major problems thus far."