We are writing school assignments in black ink.
ہم کالی سیاہی سے اسکول کی تفویض لکھ رہے ہیں۔
Generally by is used in passive voice.
Preposition means before a position.
By and With
By = person
With = solid instrument
In = Liquid instrument
The tiger killed by a boy.
The letter was written with a pen means خط قلم سے لکھا گیا
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