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