The sentence contains the phrase: ...bringing welcome relief to our overcrowding problem.
OR would it be correct to use ...bringing welcomed relief to our overcrowding problems.
Also, what is the rule for using ensure and insure and who and whom?
Original question: Also, what is the rule for using ... who and whom?
Anglika wrote:Who is at the door? 'Who" is the subject of the verb "is".
Whom do you like better - Jim or John? "Whom" is the object of the verb "like".
That's not a rule, Anglika, that's a prescription.
Re "who" and "whom"
There has been a real change in the last few decades.
"Whom" almost always sounds old-fashioned, archaic. Most native speakers don't use it.
"Who did you see there?"
"Who did you give it to?"
"Who do you believe?"
In ordinarily conversation "whom" would sound ridiculous in these sentences. [I'm a Canadian; I suspect "whom" is more common in England.]
Writing is often more formal, and you'll see "whom" more often than you'll hear it. Still, it's a dying word, and you'll never need to use it. If even native speakers don't use it, why should you?
ensure vs. insure
Will you ensure that you have insured the car?
should help you remember the difference.
But I bet not one native speaker in ten uses these two words correctly.
I suggest the best way to learn English is to pay attention to how English speakers actually speak--not to struggle with grammar rules and grammar books that are decades old, based on Latin, and more irrelevant every year.
The tendency now is to reduce the gap, the difference, between written and spoken English.