how would you write it?

Believer wrote:

I have a sentence I think I saw written somewhere. How would you rewrite it so it is correct? I think it is incorrect. Our company has a children's center for our employees [who are] in need of child care.    I can't see a problem with this sentence otherwise. The indefinite article is fine in this context I think when you have a name in the genitive, normally the article refers to the noun that immediately follows it. I have a student who has graduated from a CET's course. Here, let us assume CET stands for (the??) Certified Electrical Technician and for the above sentence, a modifies the abbreviation 'CET', doesn't it?     No - it relates to "course"; CET is merely used adjectively to identify the course. The course is unspecified apart from being a CET course, therefore "a" is correct. If the course was specifiied as a particular course in a particular institution, then "the" would be required.  "....the CET course at *** College." Do you have any suggestions that will help me to decide correctly whether there a need to put the underlined article there?

YEs, both of those need the indefinite article (although there is another problem with your second sentence; the use of 'brought up' is incorrect)/

In 'children's centre' children's is acting almost as an adjective on centre, as per a private hospital, a dogs' home (centre for rehoming stray dogs not a place where several dogs live permanently). It is a centre for children, not a centre belonging to children.

Those alternative sentences all sound ok, although I would shorten 2) to 'how to behave in front'

I don't see any major difference in meaning between them, possibly that 3) implies he learnt good behaviour on his course, whereas with 1) and 2) he could be naturally well behaved (and that sort of person is the type attracted to a CE's course).