Hey :)
1) I wish you were here.
2) If only you were here.
3) If only they weren’t so silly.
4) She wishes she could buy a phone.
Hope this helps!
A sentence with the word niches could be:
"They were trying to find their respective niches so as to be better at their jobs"
It means that they were trying to find an appropriate position for a person.
During it's time in the 1920's is was known as the "New Negro Movement".