This is a thread where non-native speakers can post questions in order to improve their English.
Since the majority of JTFers are native speakers it should be easy to give some reasonable hints.
I dont know if everyone feels confortable with it but as far as I'm concerned I encourage people to respond if they realize a lack of linguistical knowledge.
So if you feel that I have put together grammatical nonsense go ahead and correct me.
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How do I use the words "this" and "that"?
If someone describes an idea and I respond do I say I like this idea or I like that idea?
most english speakers don't know te grammatical rules as rules.
They just know what sounds right.
but I guess we learnt things like
I feel
you feel
he feels
she feels
they feel
for different verbs.
As far as the words this and that are concerned.
we just know use from hearing it.
I tried to define it myself, but found a better definition here
I find this cambridge dictionary online very concise.
I usually just use that one. But if a word is not in it, I use the oxford dictionary
http://dictionary.cambridge.orgThat
used to refer to a person, object, idea, etc. which is separated from the speaker by space or time:
The oxford english dictionary is the most authoritative dictionary in britain.
The search may not be that good though. I just amend the URL to have the correct word! so replace "that" with "this" or "bliss" or whatever.
http://www.askoxford.com/concise_oed/that?view=ukThat
..referring to the more distant of two things near to the speaker...
http://www.merriam-webster.com/popular with americans
That
...the one farther away or less immediately under observation or discussion ..
It is easy to find lots of uses of the word e.g. via google.
googling "this person" "that person"
you would hear english words used all the time. English is being used everywhere. In films. Everything. You seem to have a good vocabulary.