Analyze the sentences according to structure and grammar use.
1. The underlined words in the sentence “This long, pointed stick was first used as a weapon…” is an example of active voice in the past tense.
2. The words in bold “they” and “their”, in the text, are being used as a personal pronoun and a possessive adjective, respectively.
3. The negative form of the following sentence: “Do exercises for your arms, legs, back, and neck…” is “Don’t exercise your arms, legs, back, and neck…”.
4. The word ‘properly’ in “it’s important to warm up properly before practicing the javelin.” is an adverb that means correctly or satisfactorily.

Choose the alternative which contains the correct sentences.