VERB TO BE - Maria Cruz Villagra

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VERB TO BE
 SER O ESTAR
 Present /Past
Present 
AM (I) IS (HE, SHE, IT) ARE (WE, YOU, THEY)
+ (not) am not = ‘m not is not = isn’t are not = aren’t
PAST
WAS (I, HE, SHE, IT) WERE (WE, YOU, THEY)
+ (not) was not = wasn’t were not = weren’t
 MAIN VERB
SER
He is a good student
Albert Einstein was a famous scientist
ESTAR
He is at University
They were at the library last week
 EXISTENCE
 THERE + BE 
PRESENT 
THERE IS /ARE = HAY
There is a big problem
There are many students in the classroom
PAST
THERE WAS/WERE = HABÍA/ HUBO
There was an accident
There were many victims
 AUXILIARY VERB
PRESENT CONTINUOUS
 is/ are/ am + verb ing
He is working on the computer
I am doing my homework
They are repairing the computer
PAST CONTINUOUS
 was / were + verb ing
He was studying
They were writing their reports
	 is/ are/ am + verb ing
	 was / were + verb ing
Archimedes is considered to be the greatest mathematician
All fractions operations are needed to calculate….
He was killed by a Roman soldier
SENTENCE STRUCTURE.POSITIVE SENTENCES
Mathematics is a complex science 
Bill Gates is one of the richest people in the world
There are synchronous and asynchronous clases
Investigators are processing the evidence
The driver was speeding at the time of the accident
There were many incorrect answers
Scientists are investigating new strains of covid
Archimedes was drawing his circles when he was killed
SENTENCE STRUCTURE. NEGATIVE SENTENCES
The victim was not sleeping 
The goverment isn´t planning new measures
The results of the exams were not good
Computers are not thinking machines
There wasn´t enough evidence
Albert Einstein wasn´t just a good Mathematician.
The suspect is not in prison
There isn´t a new and more efficient method
SENTENCE STRUCTURE. QUESTION SENTENCES
Who are they?
How many students were there?
What are you doing?
Is she studying?
Was Archimedes a philosopher?
Is there any possibility?