Present perfect

Present perfect

1. Form

   • Affirmative
     • S + have/has + past participle I have tried lasagna before
   • Negative
     • S + have/has + not + past participle I have not tried lasagna before
   • Interrogative
     • Have/has + S + past participle Have you tried lasagna before?
   • We form the present perfect tense with have/has + past participle
     • Have: I You We They
     • Has: He She It

2. Using FOR and SINCE in present Perfect

   • FOR + period of time + number + time word
     • We use FOR to talk about a length of time, a period of time.
     • When we measure the duration of something or how long it lasts.
     • It has a start point and an end point and can be used in different tenses.
     • - I studied English in Boaton for 2 yeras. - I will be there for around five months. - We have been married for 20 years.
     • -For ten minutes -For eight hours -For five days -For six months -For three years -For two centuries
   • SINCE + starting point + a time / a date
     • We use SINCE to talk about a point in the past,a specific point in time.
     • When something started in the past and continues until now.
     • Since is mostly used in the present perfect and perfect progressive tense.
     • - He hasn't eaten since 7 o'clock. -I have been working here since June. - We have been married since 2015.
     • -Since 5 o'clock -Since Monday -Since July -Since 1996 -Since I left school -Since the end of the century

3. The present perfect is used to talk about an event that began in the past and continues up to the present.

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