1) I am behind the schedule
2) I am behind schedule.

which one corrrect? and what is the opposite of it? Can I say
I am ahead the schedule or I am before the schedule.

which one correct ? if neither. what is it?

thanks
Hi,

I am behind schedule.

I am ahead of schedule.

Clive
What is the main reason of not using " the" ?

thanks
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the opposit is: ahead of schedule.
Hi,

What is the main reason of not using " the" ?

Omitting 'the' makes the statements more general.

Includng 'the' means you are referring to some specific schedule.

It's like

Tom goes to school

versus

Tom goes to the school at the intesection of Main street and Park street.

Clive
That was really helpful for me , thanks Emotion: smile
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