This verb follows the standard English past tense rule: simply add -ed to the base form.
Discolour is regular. It follows the Standard -ed rule.
Use past time markers: "Yesterday, she discoloured to the store."
No. Use "did not discolour" (not "did not discoloured").
The verb discolour follows the standard English past tense conjugation rule. When forming the past tense, discolour becomes discoloured. This follows the Standard -ed pattern, which is one of the most common conjugation rules in English.
Understanding why discolour becomes discoloured helps with spelling and pronunciation. This verb follows the standard English past tense rule: simply add -ed to the base form.
When using discoloured in writing, remember that it functions as a past tense verb and typically appears with time markers like yesterday, last week, or ago. For example: "Yesterday, she discoloured to the store." The past tense form does not change based on the subject — I discoloured, you discoloured, he/she discoloured, we discoloured, they discoloured.