(1) He is motivated entirely by self-interest.
(2) She's very good at motivating her students.
(3) The plan is designed to motivate employees to work more efficiently.

(1) [可数名词, 不可数名词]an evaluation of the health care system
(2) We need to evaluate how well the policy is working.
(3) Our research attempts to evaluate the effectiveness of the different drugs.

(1) What are you frowning at me for?
(2) She frowned with concentration.
(3) In her family, any expression of feeling was frowned upon.