Every Spanish student will fall into the trap of using a cognate, a word that looks and sounds similar to another in English or another language. Many times, they will be fine, but there are quite a few that mean quite different things than they would like.
This handout explains that phenomenon but also discusses the work of "conjugation" which is done in English, but mostly by thought. In addition to discussion and practice on conjugation, I've included a section on how unconjugated verbs (infinitives) are used.
This handout can be copied double-sided for students to reference at any time.