This worksheet gives an explanation of how to use direct object pronouns in Spanish with one-verb sentences (Yo lo necesito) and sentences with a conjugated verb and an infinitive (Yo necesito hacerlo OR Yo lo necesito hacer). I give examples and include practice for students to use both options (pronoun before conj. verb or attached to infinitive).
The worksheet starts with fill-in-the-blank one-verb sentences, goes to fill-in-the-blank two-verb sentences, and then has two sections for students to apply it and translate English to Spanish. All of the vocab words are ones that second-year students should know. It's in present tense to keep it simple and put the focus on the pronouns. I've included a key.