By In Grammar :
- We Use By To Introduce Agent / doer
- Ex: The letter was written by me
- So In this Example me is Agent / doer
- Now you will ask what does it mean by Agent?
- Agent Means The person
With In Grammar:
- We Use With To Show Instrument , Material , Ingredient
- I know you are confused so let me clear your confusion with this example
- Ex: He was killed with a knife
- So as you can see in this example we have used With instead of by
- Because we use With to show from which thing any action was done
- In this Example With is telling us that the action Means Kiling was done with a knife
| BY | With |
|---|---|
Examples | Examples |
| 1 - The letter was written by me | He was killed with a knife |
| 2 - She was killed by him | The room was filled with smoke |
| 3 - A Food is cooked by me | Engine was opened with screw driver |
| 3 - Car was repaired by her | The gap was filled with Cement |
| 4 - Car was repaired by her | Engine is started with petrol |
| 5 - She was taught by him | Cake is made with flour |
| 6 - It was started by me | Food is cooked with oil |