1. He has written many books. (present perfect) 2. He has been writing many books. (present perfect progressive) The real difference between these tenses is what we are focussing on - the present perfect focuses on the result of an action. For example, with sentence 1 'he has written many books' so therefore he is an accomplished author and familiar with the process. Present perfect progressive focuses more on the doing of the action. Sometimes this indicates that the action isn't finished - as in he hasn't finished writing any of the books! For example, with sentence 2 'he has been writing many books' which is why he is tired. It's a rather subtle difference, so it really depends on what you want to use each formation for. ~ My parents will kill me if I (failed) my exams. (not correct) If I (was) tired after work tonight I won't play football (not correct) It looks like you are practising the 1st conditional, expressing the possible future. You want to use this formation: If + present simple, will + base My parents will kill me if I fail my exams. If I am tired after work tonight, I won't play football. ~ Hope this helps!

The difference is the verb tense: - Has written: Present Perfect (he started writing something in the past, but maybe it's not over yet.) - Has been writing: Present Perfect Continuous: (he started writing something in the past, and surely he is still writing right now (probably he will keep writing in the future)). Hope this helps!

There are different ways to express this sentence. And it depends on if you have already taken the exams or not. Exams have been taken: My parents will /are going to kill me if I failed my exams. Exams have not been taken yet: My parents will/are going to kill me if I fail my exams. If I am tired after work tonight, I won't play football. or If I'm tired after work tonight, I'm not going to play football.

1. He has written many books. The man has already written the books. The books are complete. (From this sentence we can't tell if he is currently writing any books.) 2. He has been writing many books. The man is in the process of writing many books. He hasn't finished writing them yet.