hi everybody my name is Alisha today I'm
going to talk about the difference between witch and that witch and that
are both relative pronouns but a lot of people confuse the two so let's talk
about how to use them okay first a quick overview which first we use witch in
what are called non restrictive relative clauses we use that on the other hand in
restrictive relative clauses so before we continue let's talk about the
difference between non restrictive clauses and restrictive clauses the
difference here a non-restrictive clause first of all where we use which is a
clause that does not have information essential to understanding the noun it
is connected to I'll show you some examples in just a minute
a restrictive clause however is a clause that has information essential to our
understanding of that noun so we need the information in the restrictive
Clause to completely understand the noun or the noun phrase it is attached to a
non-restrictive clause is sort of extra information we don't need the
information to understand the noun or the noun phrase it just provides some
more information so let's take a look at a few examples of this the first example
I have is rather extreme but it's just to show the differences between these
two first the school that I parked my car next to is dangerous so here my noun
is school here I've got the relative pronoun that I have the school that I
parked my car next to is dangerous I've used that here because my Clause is a
restrictive clause I need this information the school that I parked my
car next to is dangerous if I remove this the school is dangerous the
sentence is correct however the meaning changes the key here is that I parked my
car there so I want to explain that specifically the school that I parked my
car next to this school in particular is dangerous
so that shows us that it's a restrictive clause we have to use that in this
sentence because the information is essential to our understanding in this
sentence however the school which has a tennis court is dangerous I've used
which so which is a non-restrictive is used in non restrictive clauses this
shows us it is extra information the school has a tennis court do I need
to know this information no it's just extra information if I remove this
clause the school is dangerous the root sentence the basic sentence stays the
same this is just extra information it doesn't necessarily tell us essential
information about the situation so we use which to show that it's a non
restrictive relative clause as I said this is a rather extreme example so
let's take a look at something that's a little bit more complex okay let's look
at the next two sentences first the car which I bought last year is already
having trouble and the car that I bought last year is already having trouble
these are very similar sounding sentences
however our choice of which or that as well as the commas which I'll talk about
later have changed the meaning so there are a couple key differences here one by
seeing that in the first sentence that we're using a non restrictive clause
here with which we see the car which I bought last year this shows us that this
is extra information about the car here however we see that this is essential
information the car that I bought last year is already having trouble so the
speaker could be saying here with this sentence the second sentence the car
that I bought last year specifically a car that the speaker purchased the
previous year this sentence means therefore the speaker might have other
cars the speaker is specifically meaning this specific car that they he or she
bought last year in this sentence with the non restrictive clause we don't have
the same nuance the car which I bought last year is just ex
information in this sentence so here the car that I bought last year this is
indicating a specific car this one with the non restrictive clause it's just
giving us extra information so the speaker may or may not have another car
we don't know so that's all I want to say about that okay but a question that
many people have is how do you know whether it's a restrictive or a
non-restrictive clause so this is a quick tip a quick hint for native
speakers and non-native speakers actually it's a restrictive non
restrictive how do I know to do that remove the clause just take the clause
out of the sentence is the meaning of the sentence the same is the sentence
still grammatically correct is it okay if yes if the sentence is okay the
meaning is the same it's a non-restrictive clause if no if
the meaning changes if you lose some key information it is a restrictive clause
so this is a quick hint if you're not sure whether she use which or whether to
use that try this test as quick test just take it out and see if the meaning
changes the last thing I want to talk about here is the use of commas so
you'll notice I used commas throughout this lesson and also when I was reading
they kind of create a natural pause around this extra information but when
do you use them we should use commas around non-restrictive clauses so you
can see I used them here and here in the example sentences we use commas around
non-restrictive clauses only again this lesson , which is being recorded comma
is about which and that so when you're reading it creates a natural pause so
the reader knows there's going to be like extra information there the reader
can understand through use of these commas however do not use commas around
restrictive clauses for example the lesson that I just taught was about how
to use which and that this is a restrictive clause so I mean
specifically this lesson that I just taught was about how to use which and
that I should not include commas here because I'm not including any extra
information all of the information is it's the same with all of the other
example sentences I used in this lesson there are no commas included because all
of the information is essential the reader needs to understand everything in
one piece you can think of it that way okay so that's an overview of the
differences between which and that restrictive clauses as well and a couple
of comma tips too so I hope that this was a useful lesson for you if you have
any questions of course please feel free to let us know in the comments if you
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thanks very much for watching and I will see you again soon