Verbs ending in -e simply add -d to form the past tense. This is the most straightforward regular rule.
Diagonalise is regular. It follows the -d Addition rule.
Use past time markers: "Yesterday, she diagonalised to the store."
No. Use "did not diagonalise" (not "did not diagonalised").
The verb diagonalise follows the standard English past tense conjugation rule. When forming the past tense, diagonalise becomes diagonalised. This follows the -d Addition pattern, which is one of the most common conjugation rules in English.
Understanding why diagonalise becomes diagonalised helps with spelling and pronunciation. Verbs ending in -e simply add -d to form the past tense. This is the most straightforward regular rule.
When using diagonalised 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 diagonalised to the store." The past tense form does not change based on the subject — I diagonalised, you diagonalised, he/she diagonalised, we diagonalised, they diagonalised.