Though there are many advantages of passive voice. One of them is use of the same form of verb in all tenses and modal auxiliaries. When we make active voice sentences, the verb changes depending upon the tense. On the contrary, in passive voice sentence only the third form of verb(V3) is used. Lets understand this with the help of examples.
I am taught English- Simple Present Tense
I am being taught English –Present Continuous Tense
I have been taught English-Present Perfect Tense
I was taught English-Simple Past Tense