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The blue dress looks more flattering on you than the red one.
The blue dress looks more flattering on you than the red one does.

Why is the use of Does compulsory here?

Three times more students attend prom this year that last year.
Three times more students attended the prom this year than did last year.

Why is the use of "did" compulsory here.
Also please explain why are we not writing "than they did last year". Why is they being omitted here. Please explain
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Hi,

The blue dress looks more flattering on you than the red one.

The blue dress looks more flattering on you than the red one does.

Why is the use of Does compulsory here? It's not compulsory here.

Three times more students attended the prom this year than that last year.

Three times more students attended the prom this year than did last year.

Why is the use of "did" compulsory here. It's not compulsory here.

Also please explain why are we not writing "than they did last year". Why is they being omitted here.

The natural thing here is to say '. . . this year than last year'.

Generally speaking, repeated subjects are often omitted.

eg Mary washed the dishes and Mary dried them.

Best wishes, Clive
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I don't think it's mandatory.

There were more students this year than (there were) last year.
The blue dress looks better on you than the red one (does).

You can leave out the verb, or both the subject and the verb. I guess. [:^)]
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Comments  
Yes even I would agree to the sentence:

Three times more students attended the prom this year than last year.
but even this sentence has been mentioned as incorrect.

The only correct answer is this: (use of did is compulsory)

Three times more students attended the prom this year than did last year.
A reason why I think this could be the answer is that we cannot compare students attended the prom this year directly with just last year.

Or could it be becuase than is being forced to represent o many things.

please explain

Regards,
Adnan
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Hi,

The only correct answer is this: (use of did is compulsory)

Three times more students attended the prom this year than did last year.

Native speakers will understand the omitted subject of the second part as this.

Three times more students attended the prom this year than the number of students that attended the prom last year.

A reason why I think this could be the answer is that we cannot compare students attended the prom this year directly with just last year.

Or could it be becuase than is being forced to represent o many things.

Native speakers will have no trouble at all in understanding the intended meaning of '. . . this year than last year.'

please explain

Where are you getting the opinion that 'did' is compulsory in these cases?

Best wishes, Clive
Hi

There's a Book called Manhattan Strategy guide.

Where they have given this example and its not just there are two three more such examples.

Regards,
Adnan
adnan1947The only correct answer is this: (use of did is compulsory)
Three times more students attended the prom this year than did last year.

please explain

Regards,
Adnan

Hello Adnan,
That is NOT the only correct answer. The only explanation I can give is that your book or your teacher is incorrect.

Not only is the "this year than last year" correct, it's more natural than the "than did" version.
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Thank you. Even I thought the same, that did is not compulsory, but since they had written otherwise I was convinced that I was making a mistake.

Regards,
Adnan