Hi !
A modifier is a word that gives an information about another word in the same sentence.
It can be an adjective, an adverb or a clause.....
I write the modifers into [...]
1- He tied [red and orange] ribbons round the present.
2- For years, we kept a petdog [that gave us much joy].
3- A [strong] wind swept through the countryside.
4- [Dark] clouds were gathering in the West.
5- If we are quick, there will be tickets [available].
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Hope this a answer is correct
Hope it helps
Have a nice day