sure; certain; reliable; trustworthy; If I'm not mistaken; If I remember correctly
to make sure; to check; to ascertain; to confirm; to verify
unreliable; uncertain; indefinite; unclear
confirmation; certification; ascertainment
don't do anything rash!; keep composed!
to make sure of the truth
to strengthen; to beef up; to put on a firm basis; to ensure; to secure
to brace oneself; to keep one's spirits up; to keep one's composure; to pull oneself together; to stay strong
probability; likelihood; chances
checking the result of a calculation