hello everyone how are you today this is
Marc I'm doing just great thanks for
asking you have to be quiet during a
lecture at university or you must be
quiet during a lecture at university
Evil has to be the reason for such deaths
or Evil must be the reason for such
deaths
Students have to learn English for their
future career or Students must learn
English for their future career in this
lesson we're going to look at the
difference between have to and must so
stay tuned let me tell you first that
have to is used mostly in American
English must is used also in American
English but on property signs for
example you will see that written
visitors must report to admission
offices for example must is
slowly disappearing from the language so
is 50% less used now that in the past so
it's slowly disappearing from the
language they're both modal verbs and
they follow the following rules so with
have to the positive sentence would
follow the following formula subject +
have to + the base of the verb +
the object and then the time expression
if any with must instead the formula
goes subject + must + the base of
the verb + object and then the time
expression if any now this is easy
remember that must we don't need to this
is one thing to remember when we write a
negative sentence instead we need the
subject + the auxiliary + not
the auxiliary of the tense we are using in
this case so it could be do does did or
will etc + have to + the base of
the verb + object and then the time
expression if you use it in a negative
sentence have to in means no obligation
or necessary instead if you use must in
a negative sentence the formula would be
subject + must + not + the base
of the verb + the object and then the
time expression if any and in this case
if you use must a negative
sentence it means prohibition I will give
you two examples so the first one would
have to you don't have to call me before
coming over it's not necessary this is
what I'm saying with must instead you
mustn't drink bleach it will kill you so
you cannot you're not allowed or you
will it will kill you anyway
if you drink bleach so you mustn't now
let's go on with an interrogative
sentence so we need WH question word if
any so WH question where would be where
who how what etc then we need the
auxiliary then the subject then have to
and then the base of the verb and maybe
the object or time expression in a
question so it depends here it will
change if you want to watch a lesson on
making questions you can click here for
in an interrogative sentence with must
you have to use WH question word if you
have one then must then the subject then
the base of the verb and then the time
expression or object if any
this is very very rare okay we
usually don't use it in a question okay
now the most important thing is when on
how we use these two the first rule is
used the modal verb have to to express
strong obligation this strong obligation
is based on a rule or law and obviously
have to is impersonal so somebody else
tells you to do something impersonal
instead must we use it to indicate a
personal so personal recommendation now
I have two examples and let me show you
the two examples that I wrote these are
the examples that I gave you at the
beginning and the first one we have to
is you have to be quiet during a lecture
at university I said in this case have to
is a strong obligation right I'm telling
you because you cannot speak during
a lecture at university instead if I
say you must be quiet during a lecture
at university
this is a recommendation I'm saying to
someone okay
this is the difference then another
difference or another usage of have to
is to say how lightly something is and
in my example in the introductory
example was Evil has to be real reason
for such deaths has to be the reason and
this is lightly so it's probable that
Evil was the reason for such deaths
instead if you use a with must use must
to express conviction or certainty about
something so Evil must be the reason for
such a deaths so I'm convinced that
Evil was that reason for such deaths now
the third usage is for have to to
indicate that it's important to do
something for example the
introductory example was students have
to learn English for their future career
by this example I'm saying that is
important for students to learn English
for their future careers instead if I
use it with must, it indicates a necessity
so students must learn English for their
future career so it's necessary for
students to learn English for their
future career so you can see that it
changes meaning they can be both used
with the past so the past of have to
is had to remember that if you make a
question or a negative sentence you need
did for the past right of have to now
instead if you use must with the past it
would be must have + past participle
for the future in the have to we
have will have to so I will have to do
something next week for example so it is
used for must we don't have future and
so we use have to and one last thing
that I want to say about I have to is
that you can use have got to in British
English instead of have to it's the same
thing now let's recap so in this lesson we
talked about the difference between have
to and must have to is used for a strong
obligation instead must is for necessity
certainty or personal recommendation so
use have to for a strong obligation
based on a rule a law imposed by an
institution
or by somebody must instead is personal
and is used in the present and in the
past in the future we just used have to
that's it for today thank you very much
for watching if you have any comments
requests or if you want to write your
own example using both have to and must you
may do so under this video please don't
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see you next week with a new lesson take
care bye bye