Favorite book Hi everyone!, What is your favorite book?, say why it is your favorite?

Vacations Hi Everyone! What have been the most common problems you faced while going on vacation? and What makes an ideal vacation? I hope you could answer my questions, thank you ;)

future perfect vs future progressive Hello everyone! What's the difference between the future perfect and future progressive? I know that both are used to talk about actions in a near or distance future, but how do I know when to use it? Look these examples, which is correct? In the next fifty years or so, pollution will..: - Have destroyed most plant life. - Be destroying most plant life. Within the next ten years, people will..: - Have traveled by solar powered cars. - Be traveling by solar powered cars.