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/*
 * The contents of this file are subject to the Mozilla Public License
 * Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * https://www.mozilla.org/en-US/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is "Simplenlg".
 *
 * The Initial Developer of the Original Code is Ehud Reiter, Albert Gatt and Dave Westwater.
 * Portions created by Ehud Reiter, Albert Gatt and Dave Westwater are Copyright (C) 2010-11 The University of Aberdeen. All Rights Reserved.
 *
 * Contributor(s): Ehud Reiter, Albert Gatt, Dave Westwater, Roman Kutlak, Margaret Mitchell, and Saad Mahamood.
 */
package simplenlg.features;

/**
 * 
 * An enumeration representing the different forms a verb and its associated
 * phrase can take. The form is recorded under the {@code Feature.FORM} feature
 * and applies to verbs and verb phrases.
 * 
 *
 * @author A. Gatt and D. Westwater, University of Aberdeen.
 * @version 4.0
 */
public enum Form {

	/**
	 * The bare infinitive is the base form of the verb.
	 */
	BARE_INFINITIVE,

	/**
	 * In English, the gerund form refers to the usage of a verb as a noun. For
	 * example, I like swimming. In more general terms, gerunds
	 * are usually formed from the base word with -ing added to the
	 * end.
	 */
	GERUND,

	/**
	 * The imperative form of a verb is the one used when the grammatical
	 * mood is one of expressing a command or giving a direct request. For example,
	 * Close the door.
	 */
	IMPERATIVE,

	/**
	 * The infinitive form represents the base form of the verb, with our
	 * without the particle to. For example, do and
	 * to do are both infinitive forms of do.
	 */
	INFINITIVE,

	/**
	 * Normal form represents the base verb. For example, kiss,
	 * walk, bark, eat.
	 */
	NORMAL,

	/**
	 * Most verbs will have only a single form for the past tense. However, some
	 * verbs will have two forms, one for the simple past tense and one for the
	 * past participle (also knowns as passive participle or perfect
	 * participle). The part participle represents the second of these two
	 * forms. For example, the verb eat has the simple past form of
	 * ate and also the past participle form of eaten. Another
	 * example, is write, wrote and written.
	 */
	PAST_PARTICIPLE,

	/**
	 * The present participle is identical in form to the gerund and is normally
	 * used in the active voice. However, the gerund is meant to highlight a
	 * verb being used as a noun. The present participle remains as a verb. For
	 * example, Jim was sleeping.
	 */
	PRESENT_PARTICIPLE;
}