


= Staying up late does not affect my ability to wake up early. Staying up late has no effect on my ability to wake up early.= The medicine affects your ability to stay awake. One side effect of the new medicine is sleepiness.= The teacher affects the children in a positive way. The new teacher has a positive effect on the children.= Your diet has an effect on your weight. Pollution in the air affects our health.= The weather had an effect on our travel plans. The weather affected our travel plans.

The following example sentences show these uses: Affect is a verb almost always used to mean "to act on (someone or something) and cause a change." Effect is almost always used as a noun to mean "a change that results when something is done or happens." In other words, when you affect something, you cause an effect.
