Помогите плиз! За ранее спасибо!Compare the pairs of sentences. Explain the difference...

Question

Помогите плиз! За ранее спасибо!
Compare the pairs of sentences. Explain the difference between them. Answer the questions.
A. a. The children were trained by Mr Rich Spaceman,
b. Mr Rich Spaceman trained the children.
B. a. The notes are made in an unknown language.
b. Somebody makes notes in an unknown language.
C. a. The mystery will be cleared up.
b. The children will clear up the mystery.
Questions
1. Is there any difference in stating the doer of the action? (The doer can be: stated in the sentence, clear from the context or unknown.)
2. What is the time of the action in each pair?
3. What is the form of the verb in each sentence?

Answer 1

1.
A - a)-пассивный залог (The Passive Voice)- Дети учились у Mr Rich Spaceman.
     b)-активный залог (The Active Voice)- Mr Rich Spaceman учил детей.
В - а)-пассивный залог (The Passive Voice)- Записи сделаны на неизвестном языке.
     b)-активный залог (The Active Voice)- Кто-то делает записи на неизвестном языке.
C - a)-пассивный залог (The Passive Voice) - Тайна прояснится. 
     b)-активный залог (The Active Voice)- Дети разгадают тайну.

2. A- Past Simple
    B- Present Simple
    C- Future Simple
3. см. 1