39.one…，the other… 一个……，另一个……
here are two apples。 one is red, the other is green。
i have two pen pals. one is from the usa， the other is from south africa.
i have two t-shirts. one is white， the other is black.
i have two friends。 one likes playing the piano, the other likes playing basketball。
tom‘s parents are in china. one is a teacher， the other is a doctor.
40. some…， others… 一些……，另一些……
some boys in our class like playing football， others like playing basketball.
we are having a rest. some are sleeping， others are talking.
the students are having pe class。 some are playing soccer, others are running。
fall is coming。 some students want to go climbing, others want to go hiking。
he brought us lots of good books. some tell us how to study， others tell us how to keep healthy.
41.prefer a to b 喜欢a胜过b
(1)在狗与猫之间我更喜欢狗。i prefer dogs to cats.
(2)大多数人愿意坐火车而不愿坐汽车。most people prefer trains to buses.
(3)我宁愿写一篇学期论文也不愿参加考试。i prefer writing a term paper to taking an examination.
(4)我觉得在家里比出去好。i prefer staying at home to going out.
thousands of children nowadays prefer doing their homework to a background of pop-music to doing it in a quiet room.
42.see / hear sb. do sth. 看见/听见某人做某事
(1)今天上午我看见尧尧去上学。i saw yaoyao go to school this morning.
(2)今天下午尧尧在家里听我唱歌。 yaoyao heard me sing at home this afternoon.
(3)你经常能听到林子里鸟在歌唱吗?can you often hear the bird sing in the trees?
(4)你能看到许多鸟飞过天空吗? can you see a lot of birds fly over the sky?
we often see the children cross the street with the help of the police.