How to use Prepositions By, For and To

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Prepositions: By, For and To
BY
By + location = near
By the desk
By my house
By your drink
By a park
By + point in time = deadline
By tomorrow
By November
By 3pm
By this time next year
By spring
By + number, time period, % = amount of change
The price increased by $100.
Support dropped by 30%.
Life expectancy improved by 5 years.
Common expressions with by (not rule)
By the way
Day by day or hour by hour
Stop by
FOR
For + verb + ing / noun phrase = purpose
For cooking
For lunch
For my homework
For reference
For cleaning
For fun
For + length of time = duration of an action or condition
For 2 hours
For 3 months
For a week
For 10 years
For a second
For 30 minutes
Common Expressions with For
For a while = specified duration
For now
To go for (meal)
To look for
To work for (company)
TO
To + destination = movement
Go to bed
Drive to the store
Mail to him
Went to Canada
Sent to me
Wave to her
Walk to school
To + limit = maximum/minimum
The price increased to $100.
Efficiency dropped to 20%.
The books were stacked to the roof. 
Show relationship
This is important to me
Please respond to her message
Show time, time periods
I work 9 to 5.
The movie is 8 to 9:30.
It’s 10 to 3.
It’s a quarter to 1.