regular model: work
verbs ending in -e: like

work - model verb

Variants of the regular models:

  1. pass -s, -sh, -x, -o: +e
  2. try -y>ie
  3. omit -X>-XX
  4. die -ie: -ie>y
  5. agree -ee: +d

Irregular past tense models:

  1. cost invar.
  2. feed vowel: long>short
  3. find i>ou
  4. know [o,a]>e
  5. mean +t
  6. panic -k-
  7. pay -ay>aid
  8. send -d>-t
  9. sing i>a, u
  10. show >ed, -n
  11. stick a>u, i>u
  12. sleep -ee_>-e_t
  13. speak >o_e, o_en
  14. spell >ed, -t
  15. take -ake>-ook, -aken
  16. think >-ought
  17. wear -ear>-ore, -orn
  18. write -i_e>o_e, i_en

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toughen

It is conjugated like: work
infinitive:
present participle:
past participle:
(to) toughen
toughening
toughened
definition
in Spanish
in French
in Italian

Indicative

presentAlso known as:
present simple or simple present
Itoughen
youtoughen
he, she, ittoughens
wetoughen
youtoughen
theytoughen
simple pastAlso known as:
past simple or preterite
Itoughened
youtoughened
he, she, ittoughened
wetoughened
youtoughened
theytoughened
future
Iwill toughen
youwill toughen
he, she, itwill toughen
wewill toughen
youwill toughen
theywill toughen

Perfect tenses

present perfect
Ihave toughened
youhave toughened
he, she, ithas toughened
wehave toughened
youhave toughened
theyhave toughened
past perfectAlso known as:
pluperfect
Ihad toughened
youhad toughened
he, she, ithad toughened
wehad toughened
youhad toughened
theyhad toughened
future perfect
Iwill have toughened
youwill have toughened
he, she, itwill have toughened
wewill have toughened
youwill have toughened
theywill have toughened

Continuous (progressive) and emphatic tenses

present continuous
Iam toughening
youare toughening
he, she, itis toughening
weare toughening
youare toughening
theyare toughening
past continuous
Iwas toughening
youwere toughening
he, she, itwas toughening
wewere toughening
youwere toughening
theywere toughening
present emphatic
Ido toughen
youdo toughen
he, she, itdoes toughen
wedo toughen
youdo toughen
theydo toughen
past emphatic
Idid toughen
youdid toughen
he, she, itdid toughen
wedid toughen
youdid toughen
theydid toughen

Compound continuous (progressive) tenses

present perfect
Ihave been toughening
youhave been toughening
he, she, ithas been toughening
wehave been toughening
youhave been toughening
theyhave been toughening
past perfect
Ihad been toughening
youhad been toughening
he, she, ithad been toughening
wehad been toughening
youhad been toughening
theyhad been toughening
future
Iwill be toughening
youwill be toughening
he, she, itwill be toughening
wewill be toughening
youwill be toughening
theywill be toughening
future perfect
Iwill have been toughening
youwill have been toughening
he, she, itwill have been toughening
wewill have been toughening
youwill have been toughening
theywill have been toughening

Conditional

present
Iwould toughen
youwould toughen
he, she, itwould toughen
wewould toughen
youwould toughen
theywould toughen
perfectAlso known as:
past conditional
Iwould have toughened
youwould have toughened
he, she, itwould have toughened
wewould have toughened
youwould have toughened
theywould have toughened
present continuous
Iwould be toughening
youwould be toughening
he, she, itwould be toughening
wewould be toughening
youwould be toughening
theywould be toughening
perfect continuous
Iwould have been toughening
youwould have been toughening
he, she, itwould have been toughening
wewould have been toughening
youwould have been toughening
theywould have been toughening

Imperative

present
(you)toughen!
(we)let's toughen!
(you)toughen!

Subjunctive

present
Itoughen
youtoughen
he, she, ittoughen
wetoughen
youtoughen
theytoughen
past
Itoughened
youtoughened
he, she, ittoughened
wetoughened
youtoughened
theytoughened
future
Ishould toughen
youshould toughen
he, she, itshould toughen
weshould toughen
youshould toughen
theyshould toughen

*Blue letters in conjugations are irregular forms. (example)
*Red letters in conjugations are exceptions to the model. (example)

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