Future Perfect Tense

When do we use the future perfect tense?

In stating an action that will have been finished before some point in the future
Ex. How many children will you have had before you turn forty years old?

to show something that will continue up until another action in the future
Ex. By December of this year, I will have already toured at least three countries.

How do we make the Future Perfect?

In positive sentences=subject + auxiliary verb + auxiliary verb + past participle
Ex. They will have graduated from UP by March 2008.

In questions=auxiliary verb + subject + auxiliary verb + past participle
Ex. Will I have gone to South Korea by the end of the year?

In negative sentences=subject + auxiliary verb + auxiliary verb + past participle
Ex. I won't have gone to Australia by the end of the month.

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