Past tense of retrofit
The past simple of retrofit is retrofitted and the past participle is retrofitted: retrofit – retrofitted – retrofitted.
- Base form V1
- retrofit
- Past simple V2
- retrofitted
- Past participle V3
- retrofitted
Fitted is also correct.
Fit is also used in American English.
Start irregular verbs training
retrofit, retrofitted, retrofitted and 316 more, in Retite Pro. New accounts try it free.
Meaning of retrofit
To add a part or system that was missing when a thing was built
- ExampleThe flats were retrofitted with better insulation.
Retrofit, retrofitted, retrofitted in sentences
- Past simpleThey retrofitted the flats with insulation.
- Past participleThe engine has been retrofitted.
Common mistakes
retrofitedretrofitted. Retrofit is irregular, so it does not take -ed.
Similar verbs
Retrofit is built on fit and changes the same way.
Past simple and past participle the same, like retrofit: have, make, think, say, find, feel, keep, tell.
Common questions
What is the past tense of retrofit?
Retrofitted. For example: They retrofitted the flats with insulation.
What is the past participle of retrofit?
Retrofitted. It follows be in the passive, as in The engine has been retrofitted.
Is retrofit a regular verb?
No. Retrofit is irregular: its past forms do not end in -ed.
