revision - verb tenses

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We use the past simple:

For an action which happened at a definite time in the past. The time isstated, already known or implied.

Sheila arr ived in Tokyo last week .

For action which happened immediately one after the other in the past.He go t out of bed, went to the kitchen and  turned on the coffee

machine. 

For past habits or states which are now finished. In such cases we canalso use the expression used to.

I l ived/used to live in France five years ago. 

Time expressions we use with the past simple:

Yesterday, then, when, how long ago…? , last night/ week/ month/year/Tuesday, etc. , three days/week, etc. ago, in 1997, etc.

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We use the past continuous:

For an action which was in progress at a stated time in the past. We donot mention when the action started or finished.

I was watching the football game on TV at 8o’clock last night.

For an action which was in progress when another action interrupted it.

We use the past continuous for the action in progress (longer action) andpast simple for the action which interrupted it (shorter action).

We were playing Scrabble when the lights went out. 

For two or more simultaneous actions.

Natalie was flying her kite while her sister was riding her bicycle. 

To describe the atmosphere, setting , etc, and give background

information to a story.The sun was shining and the birds were singing that summer morning inNashville. Emily was getting ready for work and Joe was making pancakes for the children. 

Time expressions we use with the past continuous:

While, when, as, all morning/evening/day/night, etc.

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We use the past perfect:

For an action which happened before another past action or before astated time in the past.

They  had tidied  their room by the time their parents arrived. (beforeanother action) 

She had cooked dinner by six o’clock

.(before a stated time) For an action which finished in the past and whose result was visible in thepast.

Frank had washed the car, so the ground around it was wet. 

Note: the past perfect is the past equivalent of the present perfect.

She was upset because she had lost her purse. (the action took place in the

past and the result was visible in the past.)She is upset because she has lost her purse. (the action took place in the pastbut the result is visible in the present.)

Time expressions we use with the past perfect:

Before, after, already, just, for, since, till/until

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We use the present perfect:For an action which started in the past and continues up to thepresent, especially with stative verbs such as be, have, like, know,etc.

Kate has known John since 1969 .

For a recently completed action whose result is visible in thepresent.

He has just finished painting the living room. Doesn’t it look great?  

For an action which happened at an unstated time in the past. Weput emphasis on the action and do not mention the exact time becauseit is either unimportant or known.

Rob and Lucy have booked tickets to Paris. 

Time expressions we use with the present perfect:

For, since, already, yet, always, just, ever, never, so far, today, thisweek/month, etc. how long, lately, recently, still (in negations), etc.