We use the future perfect:
1. When we refer to an action which will be finished before a stated future time.
They will have finished their conference by 6 o'clock this evening.
2. With the following time expressions: by, by the time, before, until, by then, etc.
I will have cleaned my room by the time you get back.
|Positive||Subject + will have + V3|
|Negative||Subject + will + not + have + V3|
|Questions||Will + subject + have + V3 ?|
Remember the spelling rules when you add the ending -ed or -d.
|Consonant after a short, stressed vowel at the end of the word||Double the consonant.|
stop – stopped
swap – swapped
|In British English||Double one -l at the end of the word||travel - travelled|
|One -e at the end of the word|
|love – loved|
save – saved
Verbs ending in -y
|Verbs ending in 'y' preceded by a vowel (a, e, i, o, u) Add -ed.||play - played|
|Change 'y' to 'i' after a consonant. Then add -ed.||worry - worried|