This document discusses conditional sentences in English. It begins by stating the standard competencies and key competencies around understanding short functional texts and essay writing. It then explains that a conditional sentence has two main parts: the main clause and the if clause. There are three types of conditional sentences. Type 1 uses the present tense in both clauses. Type 2 uses the past future tense in the main clause and past tense in the if clause. Type 3 uses the past future perfect tense in the main clause and past perfect tense in the if clause. Examples of each type are provided. The document concludes with exercises asking the reader to form conditional sentences according to instructions and identify facts from given conditional sentences.