hello and welcome to speak American English with Lyman Holton my name is
Lyman Holton in this lesson we're going to talk about American English grammar
are you ready let's begin let's talk about what is the difference what's the
difference between present perfect and simple past now we talked about this in
past lessons but there's more to say about this only used from a time in the
past until now that's the present perfect now I'm going to put up another
board here at a moment and we're going to do the same thing with the simple
past but we're comparing this present perfect and the simple past okay present
perfect here it's only used from a time in the past until now what do we mean by
that well one two three sentences number one I've worked here for ten years we're
talking about in the past up until today now at this moment that's what's
happened in the past not the future number two she hasn't she has not she
hasn't arrived home yet we're talking about the past we expect her to a ride
home soon maybe we think she should have already been home but she hasn't arrived
home yet up to now at this time she's not here number three have they ever
been to Alaska have they ever been to Alaska at any time in their lives have
they been to Alaska any time in the past up to now up to
day that's the present perfect all right now let's take a look at the simple past
comparing the simple past with the present perfect the simple past can be
used with a finished time the present perfect cannot be okay let's look at
three sentences here number one I worked there until 2012 and then I changed jobs
but until 2012 that's a finish time so we cannot use the present perfect we're
not going to have in there the word have has been none of that number two she
wasn't at home this morning she wasn't at home this morning okay the finish
time is this morning did did they go to Alaska last year so near number three we
can't have have that we can use did go to Alaska last year last year the
facetime now up here if I made a mistake I didn't mean to say we can't use was
but I meant to say is we can't use have we're not going to use been ok so one
two three there we go comparison between present perfect and simple past that
concludes this lesson thank you for watching this video and I look forward
to seeing you at our next lesson goodbye for now