Hey! What are you doing here? I'm waiting for the bus.
嘿！你在这里干什么？我在等着公共汽车呢。 (avoid redundant words)
I was reading the evening paper when he came into the room.
我在看晚上的报的时候，他就进了房间。 (good)
While she was getting off the train she heard someone calling her name.
她正下火车的时候，她(it'd better to ommit the second 她)听见了有人大声叫她的名字。
He took another apple when you where not watching.
你不看着的时候，他又拿了一个苹果。
While I was cooking the dinner,  they were watching television.
我在做晚饭的时候， 他们都在看电视了。
She is standing outside the pub, reading a book.
她在立着在酒吧外面，看着一本书。
When I saw her, she was drinking and smoking at the same time.
我在看见她的时候，她一边喝酒一边抽烟。
He's busy getting ready for his trip to China.
他正在忙着预备他的中国旅行。
There were two beautiful paintings hanging on the wall.
墙上挂着两幅漂亮的画儿
On the first floor, there are three large windows hung with red curtains.
在第一楼，有三个大窗户，窗户上挂着红色的窗帘。
She was wearing a green dress and a yellow coat.
她在穿了一件绿色的件礼服跟一件黄色的大衣。

Good job. Most are fine.

Translation practice Chinese to English 1-11

Hey! What are you doing here? I'm waiting for the bus.
嘿！你在这里干什么？我在等着公共汽车呢。
I was reading the evening paper when he came into the room.
我在看晚上的报的时候，他就进了房间。 他走进房间的时候，我正在看晚报。
While she was getting of the train she heard someone calling her name.
她正下火车的时候，她听见了有人大声叫她的名字。
He took another apple when you where not watching.
你没不看着的时候，他又拿了一个苹果。
While I was cooking the dinner they were watching television.
我在做晚饭的时候，他们都在看电视了。
She is standing outside the pub, reading a book.
她站在立着在酒吧外面，看着一本书。
When I saw her, she was drinking and smoking at the same time.
我在看见她的时候，她一边喝着酒一边抽着烟。
He's busy getting ready for his trip to China.
他正在忙着准预备到他的中国旅行。
There were two beautiful paintings hanging on the wall.
墙上挂着两幅漂亮的画儿。

On the first floor, there are three large windows hung with red curtains.
在第一楼，有三个大窗户，窗户上挂着红色的窗帘。
She was wearing a green dress and a yellow coat.
她在穿着了一件绿色的件礼服跟一件黄色的大衣。

Translation practice Chinese to English 1-11

Hey! What are you doing here? I'm waiting for the bus.
嘿！你在这里干什么？我在等着（去掉着）公共汽车呢。
I was reading the evening paper when he came into the room.
我在看晚上的报的时候，他就进了房间。（他走进房间的时候，我正在看晚报）
While she was getting of the train she heard someone calling her name.
她正下火车的时候，她听见了有人大声叫她的名字。 她下火车的时候听见有人叫她）
He took another apple when you where not watching.
你不看着的时候，他又拿了一个苹果。   趁你没注意的时候，他又拿了一个苹果。
While I was cooking the dinner they were watching television.
我在做晚饭的时候， 他们都在看电视了。 （不要最后这个了字）
She is standing outside the pub, reading a book.
她在立着在酒吧外面，看着一本书。  她站在酒吧外面看书）
When I saw her, she was drinking and smoking at the same time.
我在看见她的时候，她一边喝酒一边抽烟。   我看见她的时候，她正在一边喝酒一边抽烟
He's busy getting ready for his trip to China.
他正在忙着预备他的中国旅行。   正在忙着准备他的中国旅行。
There were two beautiful paintings hanging on the wall.
墙上挂着两幅漂亮的画儿
On the first floor, there are three large windows hung with red curtains.
在第一楼，有三个大窗户，窗户上挂着红色的窗帘。  一层，有三扇挂着红色窗帘的大窗户
She was wearing a green dress and a yellow coat.
她在穿了一件绿色的件礼服跟一件黄色的大衣。 穿了一件绿色礼服和一件黄色的外套

Translation practice Chinese to English 1-11

Hey! What are you doing here? I'm waiting for the bus.
嘿！你在这里干什么？我在等着公共汽车呢。
I was reading the evening paper when he came into the room.
我在看晚上的报的时候，他就进了房间。 --> 他进房间的时候我正在看晚报。
While she was getting of the train she heard someone calling her name.
她正下火车的时候，她听见了有人大声叫她的名字。
He took another apple when you where not watching.
你不看着的时候，他又拿了一个苹果。
While I was cooking the dinner they were watching television.
我（在）做晚饭的时候， 他们都在看电视了。
She is standing outside the pub, reading a book.
她在立着在酒吧外面，看着一本书。 --> 她正站在酒吧外面看书。
When I saw her, she was drinking and smoking at the same time.
我在看见她的时候，她正一边喝酒一边抽烟。
He's busy getting ready for his trip to China.
他正在忙着预备（准备）他的中国旅行。
There were two beautiful paintings hanging on the wall.
墙上挂着两幅漂亮的画儿。
On the first floor, there are three large windows hung with red curtains.
在第一楼，有三个大窗户，窗户上挂着红色的窗帘。 --> 一楼（or 第一层楼）有三个挂着红色窗帘的大窗户。
She was wearing a green dress and a yellow coat.
她在穿了一件绿色的件礼服跟一件黄色的大衣。