Yes, it should be pre-qualify.
Pre construction - two words not hyphenated.
no
Yes, "pre-school" is a hyphenated word.
No it is not, I see it both ways, pre-med or pre-medical and premed or premedical.
It should be hyphenated. Pre-manufacture.
Yes it should be hyphenated.
Yes, "pre-scheduled" is hyphenated. The hyphen is used to connect the prefix "pre-" with the word "scheduled" to clarify that it refers to something that has been scheduled in advance. This hyphenation helps avoid confusion and ensures proper interpretation of the term.
Yes, "pre-surgical" is hyphenated. The hyphen connects the prefix "pre" with the word "surgical," indicating that it refers to something occurring before surgery. This hyphenation helps clarify that the term describes a specific context related to surgery.
Pre-polishing is likely a hyphenated word.
Canada
It is not one nor two words. It is hyphenated, just as it is written in the question.
The terms pre-register and pre-registration are still used with hyphens, mainly for clarity. But most dictionaries now list the words without hyphens, as preregister and preregistration.