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in the PONS Dictionary

I. fail [feɪl] VB intr

1. fail (not succeed):

fail person
fail attempt, plan
fail attempt, plan
if all else fails

2. fail (not do):

to fail to do sth

3. fail SCHOOL, UNIV:

4. fail TECH:

fail brakes
fail generator

5. fail (become weaker):

fail health, heart, voice
fail health, heart, voice

6. fail (go bankrupt):

7. fail AGR:

fail harvest

II. fail [feɪl] VB trans

1. fail (not pass):

fail course, subject
to fail sb

2. fail (let down):

III. fail [feɪl] N

1. fail:

Phrases:

'fail-safe ADJ

if all else fails ...
Present
Ifail
youfail
he/she/itfails
wefail
youfail
theyfail
Past
Ifailed
youfailed
he/she/itfailed
wefailed
youfailed
theyfailed
Present Perfect
Ihavefailed
youhavefailed
he/she/ithasfailed
wehavefailed
youhavefailed
theyhavefailed
Past Perfect
Ihadfailed
youhadfailed
he/she/ithadfailed
wehadfailed
youhadfailed
theyhadfailed