The document compares and contrasts the present perfect and present perfect continuous tenses. The present perfect is used to describe actions that began in the past and have relevance to the present. It is used with time expressions like "already" and "yet." The present perfect continuous emphasizes the continuing nature of the past action and is used with time expressions like "since" and "for." Ever and never are used with the present perfect to talk about experiences at any time or no time in the past.

1. PRESENT PERFECT VS PERFECT
CONTINUOUS

2.  PERFECT
 Change:
I’ve moved to a new school
 No time:
I’ve met an old friend there
 Recent:
We’ve have already finished a talk
about you
 Past --- up to present
We’ve known each other for 3 years.

3.  sth has happened before now/
a certain time
 Positive sentences :
I’ve already talked to him
 Questions:
Have you finished cooking
already?
 sth has not happened before
now/ certain time
 Negative sentences:
I’ve not finished yet.
 Questions:
Have you paid the bill yet?
Already Yet

4.  At any time in the past
 Positive: This is the highest
tower I’ve ever seen.
 Q: Have you ever adopted an
animal?
 At no time in the past
 Negative: I’ve never seen this
before.
= I’ve not seen this
before
Ever Never

5.  Before a date
 Ex:
since we last met
since I was young
since we were at
school
since last August
since Saturday
since 2005
since last week
 Before a period of time
 Ex:
for 3 hours
for 5 days
for a year
for a week
for 7 months
for the last week
Since For