Transcript Present Perfect vs Simple Past

Present Perfect vs
Simple Past
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Difference…
Form
Simple Past
irregular verbs: see 2nd column of irregular
verbs
Example:I spoke
Present Perfect Simple
irregular verbs: form of 'have' + 3rd column of
irregular verbs
Example:I / you / we / they have spokenhe /
she / it has spoken
regular verbs: infinitive + ed
Example:I worked
Exceptions
Exceptions when adding 'ed':
•when the final letter is e, only
add dExample:love - loved
•after a short, stressed vowel, the final
consonant is doubledExample:admit admitted
•final l is always doubled in British English (not
in American English)Example:travel - travelled
•after a consonant, final y becomes i (but: not
after a vowel)Example:worry - worriedbut: play
- played
Practice
Using the words in parentheses, complete the text
below with the appropriate tenses
Since computers were first
introduced to the public in
the early 1980's, technology
(changed/ have changed) a
great deal. The first
computers (were,
was) simple machines
designed for basic tasks. They
(did not have, did not has)
much memory and they
(were not, was not) very
powerful.
Using the words in parentheses, complete the text
below with the appropriate tenses
Since computers were first
introduced to the public in
the early 1980's, technology
technology has changed a
great deal. The first
computers (were,
was) simple machines
designed for basic tasks. They
(did not have, did not has)
much memory and they
(were not, was not) very
powerful.
Using the words in parentheses, complete the text
below with the appropriate tenses
Since computers were first
introduced to the public in
the early 1980's, technology
technology has changed a
great deal. The first
computers were, simple
machines designed for basic
tasks. They (did not have, did
not has) much memory and
they (were not, was not)
very powerful.
Using the words in parentheses, complete the text
below with the appropriate tenses
Since computers were first
introduced to the public in
the early 1980's, technology
technology has changed a
great deal. The first
computers were, simple
machines designed for basic
tasks. They did not have,
much memory and they
(were not, was not) very
powerful.
Using the words in parentheses, complete the text
below with the appropriate tenses
Since computers were first
introduced to the public in
the early 1980's,
technology technology has
changed a great deal. The
first computers
were, simple machines
designed for basic tasks.
They did not have, much
memory and they were
not very powerful.
Early computers were often
quite expensive and customers
often (payed, paid) thousands of
dollars for machines which
actually (do, did) very little.
Most computers (were,
was) separate, individual
machines used mostly as
expensive typewriters or for
playing games.
Early computers were often
quite expensive and customers
often paid thousands of dollars
for machines which actually (do,
did) very little.
Most computers (were,
was) separate, individual
machines used mostly as
expensive typewriters or for
playing games.
Early computers were often
quite expensive and customers
often paid thousands of dollars
for machines which actually did
very little.
Most computers (were,
was) separate, individual
machines used mostly as
expensive typewriters or for
playing games.
Early computers were often
quite expensive and customers
often paid thousands of dollars
for machines which actually did
very little.
Most computers were, separate,
individual machines used mostly
as expensive typewriters or for
playing games.
Times (have change, has change) .
Computers (have become, has
become) powerful machines with
very practical applications.
Programmers (has created, have
created) a large selection of
useful programs which do
everything from teaching foreign
languages to bookkeeping.
We are still playing video games,
but today's games (have become,
has become) faster, more exciting
interactive adventures.
Times have change. Computers
(have become, has become)
powerful machines with very
practical applications.
Programmers (has created, have
created) a large selection of
useful programs which do
everything from teaching foreign
languages to bookkeeping.
We are still playing video games,
but today's games (have become,
has become) faster, more exciting
interactive adventures.
Times have change. Computers
have become powerful
machines with very practical
applications.
Programmers (has created, have
created) a large selection of
useful programs which do
everything from teaching foreign
languages to bookkeeping.
We are still playing video games,
but today's games (have become,
has become) faster, more exciting
interactive adventures.
Times have change. Computers
have become powerful
machines with very practical
applications.
Programmers have created a
large selection of useful programs
which do everything from
teaching foreign languages to
bookkeeping.
We are still playing video games,
but today's games (have become,
has become) faster, more exciting
interactive adventures.
Times have change. Computers
have become powerful
machines with very practical
applications.
Programmers have created a
large selection of useful programs
which do everything from
teaching foreign languages to
bookkeeping.
We are still playing video games,
but today's games have
become,faster, more exciting
interactive adventures.
Bibliography
http://www.englishpage.com/verbpage/ver
bs6.htm
 http://web2.uvcs.uvic.ca/elc/studyzone/41
0/grammar/ppvpast.htm
 http://www.ego4u.com/en/cramup/grammar/simpas-preper
