When we want to make a conclusion, we usually use transitions to notify readers that we are going to do it. If we directly say the conclusion without transitions, it’s just like we make a hard-turn on the highway, everyone is uncomfortable.
Let’s see how we use briefly, simply put, or in short to conclude our speaking.
… Let me say it briefly, you may not need a car insurance, but you may need to pray before driving.
… and the law firm also revealed that most of our evidences are weak or incompetent. Simply put, this lawsuit is in trouble.
… In short, your car is able to run, but it won’t last long.
The following usage is incorrect.
… Brief speaking, doves are birds and bats are mammals.
The correct way to say it should be as this.
… Briefly speaking, doves are birds and bats are mammals.