Speak with people by providing them with choices. Always give them freedom of choice. Deliver your argument in a way that sounds favorable to them.
This also needs a lot of ground-work to be done, and you should know what or with whom you are dealing.
Nobody likes to be told what needs to be done, while some do, not everyone. But almost everyone likes the freedom of choice, where their internal dialogues tell them what they want to choose.
So, if you want something to get done, give the power of choice to people and magically you will still get what you want. This works when you place the choices in an obvious way to show that the one you want to get done is the winner, without being creepy. If you make it as their choice, you will have very little work to do in negotiating, convincing them for the action to be taken. Works everywhere – at home, at work, in the world.
That being said, don’t use this for manipulating anyone with wrong or misleading outcomes. Use it with a sense of care and love, and to assist people in clearing out their blocks in decision-making.
Just know when to use it.
Cheers, and good luck!