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hypothesis in the past

yet4school

Created on June 2, 2020

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Transcript

HYPOTHESIS IN THE PAST

I am sure it happened

Maybe it happened, but I'm not sure

I am sure it DID NOT happen

Maybe it DID NOT happen

KEEP IN MIND:

A FACT IS A FACT!

They made a mistake.

That is a fact, there is NO hypothesis here.

HYPOTHESIS IN THE PAST

I am sure it happened

Introduction here

I am sure it DID NOT happen

Strong hypothesis

STRONG

HYPOTHESIS

I AM SURE they made a mistake

PAST

I AM SURE they DID NOT maKe a mistake

I am sure they made a mistake

STRONG

strong, positive hypothesis

must + have + p.p.

They must have made a mistake

I am sure they DID NOT maKe a mistake

STRONG

strong, negative hypothesis

CAN'T + have + p.p.

They can't have made a mistake

HYPOTHESIS IN THE PAST

Maybe it happened, but I'm not sure

Maybe it DID NOT happen

weak hypothesis

weak

maybe they made a mistake

PAST

HYPOTHESIS

it is possible that they made a mistake

Maybe they made a mistake

weak

weak, positive hypothesis

MAY + HAVE + P.P.

They may have made a mistake

other possibilities

NOTE

there is little difference if you choose to use the auxiliaries MIGHT or COULD

They might have made a mistake. They could have made a mistake.

Maybe they did not make a mistake

weak

weak, negative hypothesis

MAY + NOT + HAVE + P.P.

They may not have made a mistake

watch out!!

NOTE

there is little difference if you choose to use the auxiliary MIGHT

but not COULD

They might not have made a mistake.= maybe they did not make a mistake

They could not have made a mistake. = it is not possible that they made a mistake

when it is a fact...

LET'S RECAP!

...there is no auxiliary. A fact is a fact!

They made a mistake.

when it is a fact...

LET'S RECAP!

When it is a hypothesis

You don't know if it happened or not

you are about 50% sure:

choose MAY, MIGHT or COULD

They may have made a mistake.

when it is a fact...

LET'S RECAP!

When it is a hypothesis

You don't know if it happened or not

you are more than 90% sure:

choose MUST or CAN'T

They MUST have made a mistake.

GOT IT??

Now, practise!