--
I have cleaned the house
-------------
+have has+ +
(has) (he--she--it)
: she has cleaned the house
he has lost his book
(have) (i--you---we---they)
: i have read this book befor
we have been here for three months
: he has just left
they have just arrived
-------------------------------------
(not) (have has)
: he hasnot lost his keys
Ihave not read this book befor
----------------------
(have has )
have you read this book befor?
yes i have ----no i havenot ---------------------------------
since
: I have met many friends since i came here
-------------
for
: Ihave studied english for three years
3
---------
already
he has already gone
--------------------
just
: I have just made my homework
----------------------
yet
: I have not finished my homework yet