Just add at the end of your current query the following:
SELECT R.*,A.*,C.*
FROM [RECRUIT] AS R
LEFT JOIN [AUTHORIZATION] A ON R.FORM_ID=A.FORM_ID
LEFT JOIN [CONFIRMATION] C ON R.FORM_ID = C.FORM_ID
However, I don't know if you want the join criteria to be with R (Recruit) or with A (Authorization).
Look for the best scenario below:
if you do...
... LEFT JOIN [CONFIRMATION] C ON R.FORM_ID = C.FORM_ID
... then you'll get C if it exists in R,
even when A doen't exist
if you do...
... LEFT JOIN [CONFIRMATION] C ON A.FORM_ID = C.FORM_ID
... then you'll get C if it exists in A,
ONLY when A exists too.
Finally, if you need C
if and only if both R and A exist, then you should use...
... LEFT JOIN [CONFIRMATION] C ON R.FORM_ID = C.FORM_ID AND A.FORM_ID = C.FORM_ID