we unified the groups
Do you mean the word integrate? Such as integrating this word into a sentence to unify the whole term.
Good relation is necessary for good communication
The bridal gown was beatiful.
Genghis khan was the one to unify them all. He ruled entire Eurasia.
Everyone has a roof on top of their house.
The principal is a good pal of mine.
Freedom is the liberty to do as one wants.
"She made good contacts which consequently led to the good position she now held"
what is a good sentence for the word opposite
This sentence is tantalizingly short.
The lanky clerk could reach any shelf in the store.
To unify = eekhed (איחד)