1) We can use the passive .... (Thousands of frames were drawn by hand.) a) When we know who did an action b) When we don't know who did an action 2) We can use the passive ( Mona Lisa painting was created a decade ago.) a) It is obvious who did the action  b) It is not obvious who did the action 3) We can use the passive (Thousands of frames were drawn by hand.) a) It is important to know who did an action  b) It is not important to know who did the action  4) In the passive sentence, When we say what is used to do the action, we use ....  a) by b) with 5) When we say what/ Who does the action in the passive sentence, we use .... a) by b) with

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