1.decide to do sth 决定去做某事 They decide to fly kite on weekend. 他们决定在周末去放风筝。 2.decide on doing sth 决定做某事 They decide on flying kites. 他们决定放风筝。 3.decide on sth 就某事决定... Betty decided on the red skirt. 贝蒂选定了那条...