FUTURE PERFECT AND FUTURE CONTINUOUS

WILL +BE+ING

I´ll be driving home when you call, so just leave me a message

TIME EXPRESSIONS

While

When

This time tomorrow

This next week

In the afternoon

Next Month

USE

Something that will be in progress at around a specific time in future

When you don´t want to express the idea that the action is part of a particular plan or intention

WILL +HAVE+PAST.PARTICIPLE

I´ll have finished this report by the end of the week.

TIME EXPRESSIONS

By Saturday

In to weeks

In the near future

By the end of a year

USE

Something that will finish before a specific time in the future

Is often used in conjuction with the tihe time expression by...meaning "at least"