What is the past tense of the verb sweet?

Answer 1

Sweetened

Sweet is an adjective rather than a verb. Sweeten is a verb, and, as stated above, sweetened is its past tense.

Another answer with additional information:

Verbs in English have four forms: present tense, present participle, past tense, and past participle.

You can always get it correct by substituting:

Present tense:

Today I sweeten.

Present participle (sometimes called gerund):

Now I am sweetening.

Past tense:

Yesterday I sweetened.

Present or past participle:

I have sweetened.

Listen to yourself speak. If you speak correct English, it works for all verbs.

Answer 2

The past tense of the verb "sweet" is "sweeted."