present perfect

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PAST PERFECT SIMPLE

由Nela b

Understanding Integer Operations and Properties

由Michele Jarosch

LANGUAGE ACQUISITION

由Tiffany Hernandez

SIMPLE PAST

由luis paspuezan

present perfect

FOR Y SINCE

SINCE

a especific date or time in the past

january 4th

on hour ago 2011 14h00

FOR

a period of time

three days

two hours

one year

NEGATIVE SENTENCES

has´nt

haven´t

they

we

you

POSITIVE SENTENCES

they´ve

we´ve

you´ve

it´s

he´s

she´s

I HAVE

i´ve

QUESTIONS

INFORMATION QUESTIONS

question word + have/has + subject + past participle + rest of sentence + ?

YES/NO

have/has + subject + past participle + rest of sentence + ?

HAS

jhon

it

she

he

HAVE

THEY

WE

YOU

I

we form the present perfect tense

with have has + past participle