Beginner Level Advanced Level
INTERMEDIATE LEVEL
Content
in theory ☊ 
tren lý thuyết ☊
→ → →
like: in theory → →
In theory, these machines should last for ten years or more. ☊ in theory ☊
That sounds fine in theory, but have you really thought it through? ☊ in theory ☊
'Aren't you supposed to be retired?' 'Yes, in theory.' ☊ in theory ☊