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HELLO,
i have a problem about making sentences for future and past predictions,[:^)]
like i know when we talk about work which willbe done in future at some point we use will have, for example :- by next year i will have leaft university.

now tell me ,

1)when we use WOULD HAVE?

2) COULD HAVE?
3) SHALL HAVE?
4) MAY HAVE / MIGHT HAVE?
HOW we make predictions and assumptions of past and future?

EXPLAIN ME WITH EXAMPLES PLZ.
thanx.
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Just to generate a few examples.

We would have to close the gate before we could allow the bull into the field.

We might have a problem with the bull.

We may have to wait for the results.

I shall have to ask permission ..

these are hard to get your head around, and in many cases the words might be interchangeable.

You might also find that the prescriptive grammer books are full of rules about this that are actually NOT what ppl do in real life, as some of these words are undergoing changes in use at the moment.

have a look at this website, run by the British Council and try out their "modal verbs" pages... http://www.learnenglish.org.uk/grammar_home_frame.html
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A few examples for predictions/assumptions in the past:

"It’s late, but he isn’t home. I thought he would have arrived by now."
"I heard a knock at the door in the middle of the night. I didn’t answer, though. It could have been a beggar."
"I couldn’t recognise the voice on the phone, but it might/may have been your brother."
"It’s 6 pm already, and we were supposed to meet at 3. You must have been very busy!"
"Next time, be more careful with that knife. It could have been my own finger you cut!"