INFINITIVE CLAUSES WITH IMPERSONAL IT

It (be) Adj + Infinitve Clause  vs. Gerund Clause (be) Adj


INFINITIVE CLAUSE
The expression "It is + adj/noun to" emphasizes information by bringing it to the front of the clause. The subject of an infinitive clause is optionally expressed as [for + noun] or the accusative pronoun [for + pronoun].  
MAIN CLAUSE
SUBORD
COMPLEMENT
"IT" IS + ADJ
"FOR" PRN
INFINITIVE CLS
It's difficult
for me
to guess what will happen.
It's hard

to know when a rat will get loose.
It's impossible
for us
to do  this project in 24 hours
It's important

to take a break twice a day.
It's possible
for you
to work on your own project.
It's exciting 
for us
to be  here.
It's likely
for it
to get cold in the laboratory.
"IT IS"  + NP
"FOR" PRN
INFINITIVE CLS
It's a good idea (noun)

to put on your lab coat.
It's a pleasure (noun)
for us
to have you here.
It's an honor (noun)
for us
to work in this lab.

IMPERSONAL IT

“IT” is used to replace a clause or phrase at the
the beginning of a sentences :

=>When an INFINITIVE is a subject of a sentence, we
usually begin the sentence with “it” and put infinitive
later.

For examples:
It is easy to criticize.  =  To criticize is easy.
It is better to be early. = To be early is better.

=>When a GERUND as a subject of a sentence, we usually begin
the sentence with “it” and put gerund later.

For examples:
It is easy talking. = Talking is easy.
It is difficult answering your questions. = Answering your questions is difficult.

=>”iT” can be used similarly when the subject of a
sentence is a clause. 
It would be possible to say:
That he has not returned is  strange.
That prices will go up is certain.
What he said yesterday is right.
What she explained two days ago is clear.

It is strange that he has not returned.
It is certain that prices will go up.
It is right What he said yesterday.
It is clear What she explained two days ago.

=>”It” is also used to express TIME:=>
1>.It is 7 o’clock.
2>.It is Sunday.
3>.It is August.
4>.It is 2008.
5>.It’s holiday.
6>.It is Romadan day.

=>”it” is also used to express “DISTANCE”:=>
1>.It is 90 kms from here to Malang.
2> It is about 1000 kms from here to Jakarta.

=>”it” is used to express “WEATHER”:=>
1>.It is raining.
2>.It is windy.
3>.It is hot.
4>.It is cold.
5>.It is winter, summer. spring, autumn.
6.>It is snowing.

 

                                                          

  Watch the video with the explanations and examples:https://youtu.be/u1PV_3sqr9E

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