Incorrect verb forms - English Grammar
www.englishgrammar.org › incorrect-verb-formsDec 18, 2013 · Incorrect verb forms. December 18, 2013 -. ESL students often find it difficult to use the correct verb form when combining with another verb. In English, the auxiliaries has, have and had are always used with past participle forms. Do, does and did are always used with infinitives. The primary auxiliary be (is, am, are, was and were) can be ...