Вивчаючи статистику

!!! State verbs do not generally have a continuous form.
Used to/Would

+	Used to/would + infinitive	He used to/would play tennis
--	Did not + use to + infinitive	He didn’t use to play tennis
?	Did … + use to + infinitive?	Did he use to play tennis?

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  We use used to/would (always/often/etc) + bare infinitive to refer to past habits or states.
  

He used to/would go jogging every morning when he was younger.

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  In such cases used to/would can be replaced by the past simple with no change in meaning.
  

When the children were younger they woke up/used to wake up late every day.

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  But for an action that happened at a definite time in the past we use the past simple, not used to.
  

I drove to work yesterday. (NOT: I used to drive to work yesterday.)

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  We also use used to to talk about past facts or generalizations which are no longer true. I used to live in Rome. Now I live in Madrid. (NOT: I would live)
  

!!! Would is unusual in the negative form and in yes/no questions.
!!! We do not use would with state verbs.


UNIT 3. Present perfect
We use the present perfect when we want to show a link between the present and the past.

+	Have/has + past participle	He’s started the assignment.
--	Have/has not + past participle	I haven’t started the assignment
?	Have/has … + past participle?	Have you started the assignment?

We use the present perfect:

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  an action which started in the past and continues up to the present, especially with state verbs (see Unit 1, above) such as be, have, like, know, etc. He has known me for six years.
  
• 
  a recently completed action. I have (just/already) finished my essay.
  
• 
  personal experiences or changes. She has put on five kilos.
  
• 
  an action that happened at an unstated time in the past. The emphasis is on the action; when it occurred is unimportant or unknown.
  

I have washed the dishes. Natalie has been to France twice.
Time expressions used with the present perfect: already (+) is used in statements and questions (to suggest surprise). I have already spoken to Ann. Have you finished cooking already?
Yet is used with the present perfect in questions (?) and negations (-).
Have you paid the bill yet? Steven hasn't finished work yet.