What is the 3 form of clean?

The three forms of clean as a verb in English grammar are base form clean, past form cleaned, and past participle cleaned. For example, present I clean the room, past I cleaned the room yesterday, present perfect I have cleaned the room. As an irregularity, clean is a regular verb so past and past participle both add -ed. In terms of adjective forms, you might consider positive clean, comparative cleaner, and superlative cleanest, as in clean, cleaner, cleanest. If you mean three forms as verb conjugations, they are clean, cleans for third person singular, cleaning as gerund present participle, and cleaned as past. So answer depends on whether you ask for principal parts or comparative forms. Most commonly taught in schools, the three forms are clean, cleaned, cleaned. Example sentences, They clean every day, They cleaned yesterday, They have cleaned the house already, showing usage of each form correctly.