Beginner Level Advanced Level
INTERMEDIATE LEVEL
Content
until the time when ☊ 
cho tới khi ☊
→ → →
like: cho tới khi → →
Were there any calls for me while I was out? ☊ call ☊
Call me when you get there, no matter what the time is. ☊ no matter who, what, where, etc. ☊
Pass the book on to me when you've finished with it. ☊ pass sth on (to sb) ☊
remember to do sth: Remember to call me when you arrive! ☊ remember ☊
Call me when you've finished. ☊ when ☊
write sb: Write me while you're away. ☊ write ☊