The first structure is the form of the tense called 'conditional perfect continuous', you'd use this to describe something that could have happened but didn't. For example: "I would have been working on Sunday, but the car broke down" This form is also used in the third conditional, which is used to talk about something that happened in the past, and the result. Essentially the third conditional can be used to say the same thing, but uses 'if' For example: "If the car hadn't broken down, I would have been working on Sunday" The difference between the two is subtle, and can be interchanged. Strictly speaking the third conditional places blame on something, whereas the conditional perfect continuous tense states a fact. Note that 'blame' in this context doesn't necessarily mean a bad thing. You can use the third conditional to blame someone or something for a good 'result'. For example: "If you hadn't made me food, I would have been hungry" The form would be + past verb is used in whats called the 'passive voice'. We use the passive voice when it doesn't matter (or is obvious) who is 'to blame'. And we use "would be" to describe something that is possible now or in the future. For example: "The money would be used to help the homeless" or "you would be hired even without experience" This can also be used as a conditional For example: "If you applied, you would be accepted" I hope all that makes sense to you! I covered (briefly) a few different grammatical topics, and it might be a bit too much to try to understand them all at once. So try to get your head around one first, and then move onto another! Elle

a) I would have been happy if .... (requires an explanation or context) b) I wold be happy with .... (statement).

When i see "will have been verbing" I think of some act being completed in the distant future. "Would be past verb" (If you are talking about the perfect tense here) is a conditional thought about something being completely done in the future or as a habit in the past...

These two are conditional sentences,for example: you and your friend are driving to somewhere and there's High way and low way 'It would be better if you took high way'-See you've not made any decision yet it's a real present condition,now you are on low way 'it would have been better if you had taken high way'-Here you have made a decision it's past unreal condition 'coz you can't go back now....

a) I would have been working if ..... b) I wold be working with ......