Answer: 1. to throw: infinitive. 2. threw: past. 3. thrown: past participle.
Explanation: an infinitive is the basic form of a verb, without an inflection binding it to a particular subject or tense, from the given options, the infinitive is "to throw." The past tense of a verb is the one that indicates the time before the moment of speaking or writing, from the given options, the verb in past is "threw." A past participle is the form of a verb, typically ending in -ed in English, which is used in forming perfect and passive tenses and sometimes as an adjective, from the given options, the verb in past participle is "thrown."