PRESENT, PAST AND FUTURE EXERCISES

Time Expressions to Use with the Present Simple
every day, month, year, etc.
Examples:
She travels to Las Vegas every year.
Jack tries to exercise every day.
adverbs of frequency (usually, sometimes, often, etc.)
Examples:
They sometimes play golf.
She rarely smokes.
Time Expressions to Use with the Present Continuous
now - Tom is watching TV now.
today - I'm working on the Smith project today.
at the moment - Jane is doing her homework at the moment.
Time Expressions Often Used in the Past
last - used when speaking about the previous week, month or year
Example:
They went on holiday last month.
yesterday - used when speaking about the previous day
Example:
I visited my best friend yesterday.
ago - used when speaking about X days, weeks, months, years before. NOTE: 'ago' follows the number of days, weeks, etc.
Example:
We flew to Cleveland three weeks ago.
in - used with specific years or months
Example:
She graduated in 1976.
when - used with a past time clause
Example:
I played tennis every day when I was a teenager.
Time Expressions Used in the Future
next - We are going to visit our friends in Chicago next week.
tomorrow - He'll be at the meeting tomorrow.
in X weeks, days, years time - use this expression with the future continuous to express what you will be doing at a specific of time in the future.
Example:
We will be swimming in a crystal blue sea in two weeks time.
by (date) - use this form with the future perfect to express what you will have done up to that point in time.
Example:
I will have finished the report by April 15.
by the time + time clause - use this form with the future perfect to express what will have happened up to a specific action in the future.
Example:
She will have bought a new home by the time he arrives.

 http://www.englishforeveryone.org/PDFs/To_Be_Exercise_10.pdf

http://www.englishforeveryone.org/PDFs/Present_Tense_Exercise_24.pdf

http://www.englisch-hilfen.de/en/exercises_list/zeitformen.htm

http://www.englishpage.com/verbpage/verbtenseintro.html