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