'had' is the auxiliary verb, 'cared' is the past participle form, and together they create the past perfect tense.
The past participle is cared.
Cared is the past tense and past participle of care.
Cared is the past tense of care.
the past tense of care is caring or cared
It is just the convention in English to apply past tense only once. I care, I cared I do care, I did care I took care, I have taken care in all instances the past tense is applied only once, at the first opportunity.
A verb in its past tense (or past participle) form.
cared
Past tense - cared. Future tense - will care. Present tense - I/you/we/they care. He/she/it cares.
The past participle of do is done. The past participle of have is had.
The past participle of am is been. Not does not have a past participle
What is the past participle of do
The past participle of have is had....:) I have had...