WILL can express insistence. In this context it is usually emphasized:
"John WILL talk about his work, even in the middle of a party."
John is someone who can't seem to talk about anything else--he insists on talking about work. He constantly talks about it; it's hard to stop him.
WOULD can express the same idea about a past situation:
"It was a nice dog but it WOULD bark all the time."
or to emphasize that some (usually unfortunate) aspect of behavior is typical of someone or something:
"We got a puncture and of course it WOULD happen when the spare wheel was under a ton of baggage!"
WILL & WOULD are used (in the negative) when ordinary things don't work as normal. There is no idea of the future, just a "refusal" to operate:
"The computer WON'T turn on. Is it plugged in?" "I turned the key but the door still WOULDN'T open." "I've asked Mary to work late but she WON'T do it."
In the affirmative WILL & WOULD can express capability or willingness:
"My new satellite TV aerial will pick up 40 foreign stations." "Teresa WILL help with the housework but she won't do any cooking."
With "to wish" WOULD is used to tell someone you would like them to do (or not do) something.
"I wish you would get to work on time." "I wish he would ask me about it."
FUTURE PERFECT
Actions which will be complete at or before a specified time in the future:
"The secretary will type the letter before she leaves. When she leaves she WILL HAVE already typed the letter."
The future perfect is often used with time expressions such as "by 10:00," "by the time I see you, " etc.:
"BY the time John retires he WILL HAVE been working for 46 years." "Judy WILL HAVE opened her own medical practice BY 1999." "Call me tomorrow. I WILL HAVE heard from Jim BY then."
This form is often also used to express expectation in the present:
"John left an hour ago and it's not far. I'm sure he WILL HAVE arrived by now."
CONDITIONAL and PAST CONDITIONAL
"I WOULD do it now if I had time." (but I don't) "I WOULD have done it then if I had had time." (but I didn't)
I don't mind having friends come around but why is it they ____________ come right in the middle of dinner.
will
would
will have
would have
If Jim had asked me, I __________ him paint the shed.
will help
would help
will have helped
would have helped
Come round at five o'clock, by then I ___________ my work and we can go for a bike ride.
will finish
would finish
will have finished
would have finished
I ______________ sweeping the yard earlier, but the neighbour kept talking to me.
will finish
would finish
will have finished
would have finished
It's always the same! Just before the meeting ends John ___________ some irrelevant issue.
will raise
would raise
will have raised
would have raised
Why are the takeover negotiations taking so long? I thought the bank ____________ talks with the new investors by now.
will finish
would finish
will have finished
would have finished
The bride and groom got into the ancient Daimler they had specially hired and guess what? - the car __________ . Not a very good omen I'm afraid!
won't start
wouldn't start
won't have started
wouldn't have started
Don't worry about the wedding reception, it will be fine. I am sure Julia ___________ the reservations at the restaurant.
will already make
would already make
will already have made
would already have made
It's mid-afternoon, I wouldn't call the office now, Karl __________ out. He had an appointment with the mayor at 3pm.
will go
would go
will have gone
would have gone
All his life he believed the castle was haunted but kept the story to himself. If he had talked about it, no one _________ him.
will believe
would believe
will have believed
would have believed
Everybody respected old Henry. Do you remember how nobody ___________ down at the board meetings till after he did?
will sit
would sit
will have sat
would have sat
Yes, last years results were bad: to have any hope of reaching last years production targets, clearly we ___________ the new production line by last September at latest. October was far too late.
will have to install
would have to install
will have to have installed
would have to have installed
If the bank lend us half the money for our new shopping complex and we approach private investors for the remainder ________ come up with the rest of the funds?
will they
would they
will they have
would they have
My boss wastes a lot of time checking thing unecessarily. He _________ insist on re-reading every letter himself before it goes in the post.
will
would
will have
would have
You should like this chili. I didn't put too much pepper in it. I __________ put more in but I know you don't like hot food.
will
would
will have
would have
If we had approached the banks before the current crisis for funds to construct the new shopping complex ________ come up with the rest of the funds?
will they
would they
will they have
would they have
My last boss wasted a lot of time checking thing unecessarily. He _________ insist on re-reading every letter himself before it went in the post.