Verbs ending in a consonant followed by -y change the -y to -ied in the past tense form.
Telephony is regular. It follows the -ied Conversion rule.
Use past time markers: "Yesterday, she telephonied to the store."
No. Use "did not telephony" (not "did not telephonied").
The verb telephony follows the standard English past tense conjugation rule. When forming the past tense, telephony becomes telephonied. This follows the -ied Conversion pattern, which is one of the most common conjugation rules in English.
Understanding why telephony becomes telephonied helps with spelling and pronunciation. Verbs ending in a consonant followed by -y change the -y to -ied in the past tense form.
When using telephonied 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 telephonied to the store." The past tense form does not change based on the subject — I telephonied, you telephonied, he/she telephonied, we telephonied, they telephonied.