teacher evaluation for common app/ separate letter?

do you ask the teacher to write the letter of recommendation in the space provided in the evaluation sheet or do you attatch a separate sheet with the school’s letterhead?

if i use the common application, do i also have to use their teacher evaluation form? if no, what do i do for the rec part?

<p>The teacher rec form says "A photocopy of this reference form, or another reference you may have prepared on behalf of this student, is acceptable." Even if your teachers attaches another letter of recommendation, if would be best if he/she could fill out the other parts of the common app teacher rec form (the contact info and the checkboxes)</p>