1.My mother often asks me to help her clean the room.He asked them to keep quiet in the library yesterday.
2.Our teacher usually ask us to obey the school rules when we are at school.
2.ask sb to do sth汉语意思是请求某人做某事可以用于各种时态。注意sb用宾格。
ask sb to do sth意为请求某人(不)做某事;叫某人干，接以动词不定式充当补足语的复合宾语。当然也可接双宾语,这时两个宾语都是直接宾语,指物的直接宾语可由名词、代词、带疑问词的动词不定式或why从句充当。侧重于请求某人独自去做某事.
