Perfect Aspect | The parts of speech | Grammar | Khan Academy Video Lecture | Complete Course on English Grammar: Upgrade your Speaking & Listening - Personal Skills

hello grammarians today I want to talk
to you about the idea of the perfect
aspect of verbs and what that means is
that it's not you know beyond reproach
or that it's like beautiful and shiny
now what it means is really that
whatever we're talking about whatever
action we are talking about is complete
so we use the perfect aspect in all
tenses to illustrate when something has
been completed prior to the present
moment so when we talk about the present
we're talking about one point now but
when we're using when we use aspect it
enables us to talk about a period
between then and now you're speaking in
the now referring to a point previous so
we could say using the perfect the way
you form the perfect is you simply add
have and then you use the past form of
the verb so if my assignment for example
were to wash some dishes when the dishes
were complete I would say to the person
that told me to wash the dishes
I have wash the dishes so I'm using the
present tense form of to have and the
past tense form of washed so as with the
progressive aspect the thing that
changes is the helper verb this part the
main verb does not change it remains in
the past tense even if we're talking
about the present or the future the part
that changes is have so if we want to
put this story in the past you know talk
about a period that is then but also say
that we wash the dishes at a period
before then write a time before the
moment in the past that we're talking
about if that makes sense we would say I
had washed the dishes and if we want to
talk about something in the future that
happens before that future moment but
after now we would use the future
perfect to say I will have washed the
dishes and that's what the perfect
aspect allows us to do it allows us to
travel backward in time a little bit
extra it allows us to say oh well before
the point in this story that I'm
mentioning this thing
already completed so the perfect enables
us to say here is a thing that happened
in the past
here is a verb action that has completed
in the past prior to the moment I'm
talking about so to recap the perfect
refers to something finished you can
learn anything David out