1. I have seen her make a cake
=>Cách 1 : She has been seen make a cake
Cách 2: A cake has been seen to her make
2. She observes him do his homework
=>He is observed do his homewwork
His homework is observed to him do
3. They are noticing them making fireworks
=>They are noticed making fireworks
Fireworks are noticed to them make.
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