81. forget doing sth. 忘记做过某事了（已做） 

　　Eg. I forgot turning off the lights. Look, it is dark in the room.

　　82. forget to do sth. 忘了做某事了（未做） 

　　Eg. I forgot to turn off the lights. Could you go back and shut the off?

　　83. remember doing sth. 记得做过某事了（已做） 

　　Eg. I remembered returning your money. You are so forgetful.

　　84. remember to do sth. 记住去做某事（未做） 

　　Eg. Remember to bring me some money. I’ve run out of it.

　　85.stop to do sth. 停下来去做某事 

　　Eg. He stopped to talk with Mary when she enter the office.

　　86. stop doing sth. 停止做某事 

　　Eg. The students stopped talking when the teachet came in.

　　87. watch/see/hear sb. do sth. 观看/看见/听见某人做了某事（全过程） 

　　Eg. I saw you pick an apple just now.

　　88. watch/see/hear sb. doing sth. 观看/看见/听见某人正在做某事（点动作） 

　　Eg. I saw you playing basketball with your classmates on the playground last Sunday.

　　89. go on doing sth. 继续作某事 

　　Eg. He went on reading after a short rest.

　　90. go on to do sth. 继续作某事 

　　Eg. He went on to read after finishing wash the dishes.

（责任编辑：张君琳）