The number of students in this school is more than that of students in that school.

1. There are three times as many students in this school as there are in that school.

2. The number of students in this school is more than that of students in that school.


Are there any mistakes of the above two sentences? If there are, how can I correct?

There are more students in this school than there are in that school.

neb090 said:

1. There are three times as many students in this school as there are in that school.

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That's correct and well phrased.

neb090 said:

2. The number of students in this school is more than that of students in that school.

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Firstly, a number cannot be 'more' than another number. You should use 'higher' or 'greater' instead.

Secondly, the red part is wrong. If you use that, it refers to 'the number of students', not to 'the number', so if you delete of students, it's passable. To improve it further, delete the entire red part.

jutfrank said:

That's correct and well phrased.

Firstly, a number cannot be 'more' than another number. You should use 'higher' or 'greater' instead.

Secondly, the red part is wrong. If you use that, it refers to 'the number of students', not to 'the number', so if you delete of students, it's passable. To improve it further, delete the entire red part.

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So I organize those sentences as a conclusion, and are they correct?

1. The students in this school are more than those in that school. (wrong point: more than what?)
2. There are more students in this school than those in that school. (wrong point: those)
3. There are more students in this school than (there are) in that school. (correct)
4. The number of students in this school is higher than that in that school. (correct)
5. The number of students in this school is higher than in that school. (correct)

Is my conclusion correct?

neb090 said:

Is my conclusion correct?

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If I understand you properly, yes.

jutfrank said:

If I understand you properly, yes.

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How about the following sentences:

1. The number of machines is twice as many as those of ten years ago.
2. The number of machines is twice compared to (what it was) 10 years ago.
3. There are twice as many machines as there were 10 years ago.

#3 is correct. The others are not.

5jj said:

#3 is correct. The others are not.

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How could I correct #2 and #3?

Please read our replies carefully. It was pointed out to you above that #3 is correct. Here are some alternatives to the other two.
The number of machines is double what it was ten years ago.
There are twice as many machines (now) as there were ten years ago.

teechar said:

Please read our replies carefully. It was pointed out to you above that #3 is correct. Here are some alternatives to the other two.
The number of machines is double what it was ten years ago.
There are twice as many machines (now) as there were ten years ago.

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Sorry. They are my #1 and #2.

The students of this school are more in number than that of that school.

In this sentence, should I use "that" or "those?"

neb090 said:

The students of this school are more in number than that of that school.

In this sentence, should I use "that" or "those?"

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Don't use that sentence. It's no good.

jutfrank said:

Don't use that sentence. It's no good.

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If it is just inspected in a grammatical angle, is that or those correct?

neb090 said:

If it is just inspected in a grammatical angle, is that or those correct?

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those

@neb090 Did you see post #2?