The past tense of 'to back' is 'backed'.
Backed is the past participle of back.
The past tense is came back.
The simple past tense is "gave back"
a past maybe
You can't go back to the past.
The past tense is backed.
called back.Call back is a phrasal verb. When changing to past only the form of the verb call changes. The adverb back remians the same.
Got back.
went back
I got back
Another way to say "back then" is "in the past" or "in earlier times."
No. If it is being used as a verb, "back" is the present tense. The past tense would be backed.