--

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