Grammar fix
be behind schedule
behind schedule
To be later than planned in completing work or reaching a deadline.
collocation
How oftenCommon
LevelB2
Used inSpeech & writing
Hear it in context
Notice where the phrase sounds natural.
The building work is already two weeks behind schedule.
When a group project is behind schedule, I usually suggest dividing the remaining tasks more clearly.
Fix the pattern
One small grammar move makes it sound right.
Not: The project is behind of schedule.
Say: The project is behind schedule.
Say 'behind schedule' without 'of'.
Don't confuse it
Other ways to say it
Be later than planned
Which delayGeneral scheduleLate arrival
be behind scheduleYou're here · Work, travel, or an event is progressing later than planned.
be running behindConversational: your activities are taking longer than expected.run lateOften explains why someone will arrive or finish late.