In the English language, a modal verb is a type of auxiliary verb. The key way to identify a modal verb is by its defectiveness (they have neither participles nor infinitives). In addition, modal verbs do not take the inflection -s or -es in the third person singular, unlike other verbs.

The modal verbs in English are as follows, paired as present and preterite forms.

Note that use of the preterite forms does not necessarily refer to past time.

The following have also been categorized by some as modal verbs:

Note that dare and need are much more commonly used as non-modal verbs, taking -s in the third person singular and having an infinitive and past and present participles. Further, some authors do not mention had better and explicitly reject ought (to) on the grounds that the main verb infinitive is required to include the particle to.

The following are not modal verbs although they have some similar characteristics:

If a verb is preceded by multiple auxiliary verbs including a modal, as in "it could have been eaten," the modal will always appear before the other auxiliary verbs. A verb or auxiliary verb following a modal always appears in its basic form (for example, "could have gone" instead of "could had gone" or "could has gone", and "He could walk" rather than "he could walks").

William "Bill" Maher, Jr. ( /ˈmɑːr/; born January 20, 1956) is an American stand-up comedian, television host, political commentator, author, and actor. Before his current role as the host of HBO's Real Time with Bill Maher, Maher hosted a similar late-night talk show called Politically Incorrect originally on Comedy Central and later on ABC.

Maher is known for his political satire and sociopolitical commentary, which targets a wide swath of topics including religion, politics, bureaucracies of many kinds, political correctness, the mass media, greed among people and persons in positions of high political and social power, and the lack of intellectual curiosity in the electorate. He supports the legalization of marijuana and same-sex marriage, and serves on the board of PETA. He is also a critic of religion and is an advisory board member of Project Reason, a foundation to promote scientific knowledge and secular values within society. In 2005, Maher ranked at number 38 on Comedy Central's 100 greatest stand-up comedians of all time. Bill Maher received a Hollywood Walk of Fame star on September 14, 2010.

George Hosato Takei (武井 穂郷, Takei Hosato^?, /təˈkeɪ/tə-KAY; April 20, 1937) is a Japanese American actor, best known for his role as Hikaru Sulu, helmsman of the USS Enterprise in the television series Star Trek. He is a proponent of gay rights and active in state and local politics as well as continuing his acting career. He has won several awards and accolades in his work on human rights and Japanese American relations, including his work with the Japanese American National Museum.

Takei was born in Los Angeles, California to Japanese American parents, Fumiko Emily (née Nakamura) and Takekuma Norman Takei, who worked in real estate. His father was an Anglophile, and named him George after George VI of the United Kingdom, whose coronation took place in 1937. In 1942, the Takei family was forced to live in the horse stables of Santa Anita Park before being sent to the Rohwer War Relocation Center for internment in Arkansas. The family was later transferred to the Tule Lake War Relocation Center in California. He and his family returned to Los Angeles at the end of World War II. He attended Mount Vernon Junior High School, where he served as student body president, and Los Angeles High School. He was a member of Boy Scout Troop 379 of the Koyasan Buddhist Temple.

William Alan Shatner (born March 22, 1931) is a Canadian actor, musician, recording artist, author and film director. He gained worldwide fame and became a cultural icon for his portrayal of James T. Kirk, captain of the USS Enterprise, in the science fiction television series Star Trek from 1966 to 1969, Star Trek: The Animated Series from 1973 to 1974, and in seven of the subsequent Star Trek feature films from 1979 to 1994. He has written a series of books chronicling his experiences playing Captain Kirk and being a part of Star Trek, and has co-written several novels set in the Star Trek universe. He has also authored a series of science fiction novels called TekWar that were adapted for television.

Shatner also played the eponymous veteran police sergeant in T. J. Hooker from 1982 to 1986. Afterwards, he hosted the reality-based television series, Rescue 911 from 1989 to 1996, which won a People's Choice Award for Favorite New TV Dramatic Series. He has since worked as a musician, author, producer, director and celebrity pitchman. From 2004 to 2008 he starred as attorney Denny Crane in the television dramas The Practice and its spin-off Boston Legal for which he won two Emmy Awards and a Golden Globe Award.

John Patrick McEnroe, Jr. (born February 16, 1959) is a former world no. 1 professional tennis player from the United States. During his career, he won seven Grand Slam singles titles (three at Wimbledon and four at the US Open), nine Grand Slam men's doubles titles, and one Grand Slam mixed doubles title. McEnroe also won a record eight season ending championships, comprising five WCT Finals titles and three Masters Grand Prix titles from twelve final appearances at these two events, a record he shares with Ivan Lendl. He posted the best single season win-loss record in the Open Era in 1984 at 96.47% (82/3). In addition he won 19 Championship Series top tier events of the Grand Prix Tour that were the precursors to the current Masters 1000.

He is best remembered for his shot-making artistry and superb volleying; for his famous rivalries with Björn Borg, Jimmy Connors and Ivan Lendl; for his confrontational on-court behavior which frequently landed him in trouble with umpires and tennis authorities; and for the catchphrase "You cannot be serious!" directed toward an umpire during a match at Wimbledon in 1981. He was inducted into the International Tennis Hall of Fame in 1999, and is regarded as one of the greatest tennis players of all time.