If your child can't resist throwing gravel in the park, in spite of your efforts to offer tempting alternatives, you can say, "I'm taking you home now. I don't want anyone to get hit by a rock, even a little one." If your child wants to help put pancake batter in the pan, but despite friendly reminders you can't convince him not to jump around at the stove, you can say, "I can't cook with you now. I'm too worried about burns.” If your child refuses to get in his carseat, "I can see the seat belt is uncomfortable. You feel freer without it. I can't take you to your friend's house without the belt buckled." Or, "I don't want to be late for work. I'm buckling you in. I know how much you hate it!
