PRESENT PERFECT


Present Perfect Simple
 We use the present perfect tense to talk about things that have already happened but the time hasn’t finished. For example, things that we have done today. Today hasn’t finished but the things we have done have.
  A = Subj. + have/has + past participle (3rd column) + compl.
E.g.: I have finished my homework.
N = Subj. + haven’t/hasn’t + past participle + compl.
E.g.: I haven’t finished my homework.
I = Have/Has + subj. + past participle + compl.?
E.g.: Have you finished your homework?


Adverbs of Frequency and common structures

- Already (between have and the past participle)
- Just (between have and the past participle)
- Yet (end of the sentence): negative and interrogative sentences only.
- Have you ever...?
- Today
- This week, this month, this year, this summer...
- Since + date, concrete moment
- For + duration

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 Present Perfect Continuous
We use the present perfect continuous tense to talk about things we have been doing for a certain period of time.
In Spanish we may translate this structure by “llevo tanto tiempo haciendo algo”.
 
A = Subj. + have/has + been + verb-ing + compl.
  E.g.: I have been studying all day.
N = Subj. + haven’t/hasn’t + been + verb-ing + compl.
  E.g.: I haven’t been studying.
I = Have/Has + subj. + been + verb-ing + compl.?
  E.g.: Have you been studying all day?

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