classify

English as a Second Language English Vocabulary, Grammar and Idioms
1
  1. Please classify the animals as predators, herbivores or scavengers.
  2. Please classify the sentences into what types.
  3. Please classify the sentences by type/group.
    Please check the above and correct them.
2
  1. OK.
  2. Not right.
  3. “by type” is OK. “by group” might be OK in the right context, if “group” is defined as a means of classification. Without further context, “group” seems to refer to the result of classification rather than the means (e.g. you would say “classify into groups”).
3

Dozy,

  1. Can I say as below:
    “Please classify the sentences into types.”?
  2. Can I use ‘categorize’ in place of ‘classify’ in those sentences?
4

  1. I guess so, but “by type” seems preferable to me, as far as I can tell with no further context.

  2. Yes.

5

Dozy,
‘classify’ has also another meaning.
For example:
Classify these documents.
= Declare unavailable these documents, as for security reasons.
Am I correct?

6

Yes, that’s correct. It is an extension of the ordinary meaning. Really it means “classify (documents etc.) as secret/confidential/etc.”, but in suitable contexts the “as secret/confidential” part is omitted and assumed.