With, Over, By

With
'With' is used to mean 'together' or to show involvement
I was with a friend when I met Sandy.
He worked with his brother in their restaurant.
He ordered champagne with his meal.
Why don't you come shopping with me?

'With' to mean 'having'
I was talking to you about that girl with blonde hair.
He speaks with a French accent.
Only people with money shop in that street.

'With' to mean 'using'
I came here with my new bike.
This cake was not made with any sugar.
He made that table with his own tools.

'With' to show feelings
He walked into the room with confidence.
He wrote that song with strong emotions.

Over
'Over' is used to show movement
I went over to my sister’s house for dinner.
The car almost fell over the edge of the cliff.
Several trees were blown over by the storm.

'Over' to mean more than the expected amount
We will organise a reception for ten people and over.
They've been talking for over an hour.
We have gone over our budget.
I have not met her for over a month.

By
'By' to mean 'close'
You can sit by the fire.
He stood by the manager during the speech.
I live in a house by the sea.

'By' to show a specific reason
You can practise English by reading.
I said what I thought by writing a letter.
We found the hotel by pure chance.

'By' to show how
I received the new manual by courier.
I go to work by bus.
You can only get to the village by helicopter.