Don't even think of using them. They weaken most, if not all, sentences. And they can almost always be replaced by more telling verbs. Further, using strong verbs rather than these flaccid and unimaginative forms contributes to word economy. The sentence is now three words shorter and contains a strong verb as its engine.
Active verbs make for vital sentences.
The active voice verb provides pace and movement. It uses verbs to push, strike, carry, and persuade. The passive voice makes for sluggish reading. It slows the pace. And the passive voice usually requires the use of more words.