1. We live in 50 Le Hong Phong Street. 
=>We live at 50 Le Hong Phong Street.(at:tại: chỉ nơi chốn
2. They speak French to her, not English, so her English doesn't improved. 
=> They speak French to her, not English, so her English doesn't improve.(sau doesn't(trợ động từ) thì giữ nguyên thể.
3. She is very shy although she doesn't enjoy parties. 
=>She is very shy so she doesn't enjoy parties:Cô ấy rất nhút nhát nên cô ấy không thích tiệc tùng

4. He smokes so many, perhaps that's why he can't get rid of his cough. 
=>He smokes so much, perhaps that's why he can't get rid of his cough. =>Vì anh ấy hút thuốc ko đếm đc nên dùng much.
5. He doesn't work overtime, so he doesn't earn as much as I am. 
=>He doesn't work overtime, so he doesn't earn as much as I do.

1. in => at

=> at + số nhà/đường

2. improved => improve

=> sau trợ động từ động từ giữ nguyên

3. although => because

4. many -> much

=> vì smoke không đếm

5. do

=> vì phía trước dùng động từ thường