Some girls are singing under the trees.

　　The road is under repair.(be under repair 正在修理)

　　From here， we can see the bridge under construction.

　　Scientists believe that they will get weather under control

　　some day.(under control 在控制之中)

　　The proposal is now under discussion.(proposal 提案)

　　The unpopular mayor is under constant attack in the newspapers.

　　with(和……)

　　Who was that with you? 你刚才和谁在一起?

　　Our teacher is strict with us.(be strict with sb. 对某人严格要求)

　　My father is always patient with me.(be patient with 对某人有耐心)

　　We’re satisfied with our work.(be satisfied with 对……满意)

　　She is discussing the idea with her tutor.

　　We’re familiar with each other.(be famililar with 熟悉 similiar to 相似)

　　Her eyes were filled with tears.(be filled with 充满)

　　He’s in bed with flu.

　　The ground was covered with snow.

　　The street is crowded with people.(be crowed with 拥挤)

　　He wanted to kill two birds with one stone.( 一举两得)

　　The girl greeted me with a smile.

　　The young man with glasses over there is my brother.

　　What’s the matter with you?

　　I found the place with great difficulty.(with great difficulty费很大劲)

　　It’s hot outside. He was working there with only a T-shirt on.

　　The girl was sitting in a chair with her hands folded.