I saw a example sentence of the phrase red flag, but I don't understand what the sentence means.

Learn to recognize red flags that might indicate your child is having problems with self-esteem.

Shouldn't "Learn" be gerund form???? or it's the abbeviation of "to learn" ??

And please explain the meaning of this sentence, Thanks:)
Hi,

I saw a example sentence of the phrase red flag, but I don't understand what the sentence means.

Learn to recognize red flags that might indicate your child is having problems with self-esteem.

Shouldn't "Learn" be gerund form?? or it's the abbeviation of "to learn" ?? Neither. It's the imperative form of the verb 'learn'. The imperative is used to give an order or to give strong advice.

eg Stand up!

eg Listen!

eg Speak English!

eg Learn English!

eg Learn to speak English!

And please explain the meaning of this sentence,

The writer is advising parents that they should learn to recognize danger signals (ie red flags) that their children are having these problems.

eg If a formerly polite child suddenly starts to behave rudely, the parents should ask themselves if the child is having some kind of problem.

Clive
Hi

Red flag is symbolic for "warning sign." A "red flag" might be that the child does not want to play with other children.

The verb "learn" is imperative.
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Hello

The sentence is in the imperative and means:

You should learn to recognize the warning signs that indicate your child is having problems with self-esteem.

In nautical terms, a red flag is a sign of danger. Somehow this has found its way into general use.

A "red flag" is a warning that something is wrong and one shoud be cautious.

The command "Learn to recognize" is the shortened form of "You must learn to, You should learn to, You need to learn to..."

Hope this helps.

John