I have sold the last one.
(add 'just' in the right place)
I have just sold the last one
Adverbs go between the helping verb and the past participle in positive statements.
I've been studied English since three months.
for three months.
For emphasis a period of time. Since emphasis a specific point in time.
I haven't finished my dinner ___ .
I haven't finished my dinner yet.
We use yet (meaning up to now) for negatives and questions! It usually goes at the end of the sentence.
How much times have you eaten pizza?
many times
much is used for uncountable nouns. Many for countable.
A: Why don't you read this book?
B: No thanks. I've ____ ready it three times.
I have already read it three times.
already emphasizes completion.
Have you ever being to Florida?
been to Florida.
'Being' is the present participle. We must use the past participle 'been' in present perfect.
I've ____ arrived!
I've just arrived!
He's had three jobs since he has come to the U.S.
since he came to the U.S.
Remember to use 'past simple' after 'since'
Have you finished your essay ____ ?
Have you finished writing your essay yet?
Yet is used with questions and negatives and is usually placed at the end of the sentence.
How long do you had your computer?
How long have you had your computer?
'do' is not the helping verb of present perfect.