Usage patterns
〈物〉に砂糖を入れるto add sugar to something
I put sugar in my coffee.
〈物〉に砂糖をかけるto sprinkle sugar on something
I sprinkled sugar on the strawberries and ate them.
砂糖を溶かすto dissolve sugar
I dissolved sugar in hot water to make syrup.
砂糖を控えるto cut back on sugar
I'm cutting back on sugar for my health.