They determine how a verb is conjugated for Tense–aspect–mood. If the base form ends in a consonant plus -y (e.g. { bidder: 'ix', params: { siteId: '195455', size: [300, 250] }}, { bidder: 'sovrn', params: { tagid: '705055' }}, { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_mpuslot3_flex' }}, Present perfect simple or present perfect continuous? { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_SR' }}, { bidder: 'ix', params: { siteId: '555365', size: [300, 250] }}, In Wati languages, verbs generally fall into four classes: They are labelled by using common morphological components of verb endings in each respective class in infinitival forms. { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_leftslot_160x600' }}, { bidder: 'ix', params: { siteId: '195458', size: [336, 280] }}, (adsbygoogle = window.adsbygoogle || []).push({ { bidder: 'openx', params: { unit: '539971065', delDomain: 'idm-d.openx.net' }}, { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, { bidder: 'ix', params: { siteId: '195454', size: [336, 280] }}, { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_btmslot' }}, { bidder: 'openx', params: { unit: '539971066', delDomain: 'idm-d.openx.net' }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162050', zoneId: '776338', position: 'btf' }}, { bidder: 'sovrn', params: { tagid: '446383' }}, Learn the most important irregular verbs, one per day, straight to your inbox. { bidder: 'openx', params: { unit: '539971065', delDomain: 'idm-d.openx.net' }}, {code: 'ad_rightslot2', pubstack: { adUnitName: 'cdo_rightslot2', adUnitPath: '/2863368/rightslot2' }, mediaTypes: { banner: { sizes: [[300, 250], [120, 600], [160, 600]] } }, { bidder: 'ix', params: { siteId: '195452', size: [300, 250] }}, { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_rightslot2_flex' }}, How we use English verb forms  (tenses) is essential to developing good communication in English. {code: 'ad_btmslot_a', pubstack: { adUnitName: 'cdo_btmslot', adUnitPath: '/2863368/btmslot' }, mediaTypes: { banner: { sizes: [[300, 250]] } }, type: "html5", { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_rightslot2_flex' }}, "sign-in": "https://dictionary.cambridge.org/auth/signin?rid=READER_ID", { bidder: 'ix', params: { siteId: '555365', size: [160, 600] }}, 2020 LearnEnglish LanguageWell. Regular verbs add -ing to the base form to make the -ing form, and -ed to the base form to make the past simple and the -ed form. { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162050', zoneId: '776340', position: 'btf' }}, This means that any regular Latin verb can be conjugated in any person, number, tense, mood, and voice by knowing which of the four conjugation groups it belongs to, and its principal parts. { bidder: 'onemobile', params: { dcn: '8a9690ab01717182962182bb50ce0007', pos: 'cdo_mpuslot3_mobile_flex' }}, tell us something about an action, series of events or a situation that happened before a certain time: tells us about an action, series of events or situation that happened before the Present, I have lived in Hong Kong since 2007 (I started living in HK in 2007, and I still live there now), Mary has seen the film “Gone with the Wind” more than 25 times (25 times in her life and she is not dead). { bidder: 'openx', params: { unit: '539971081', delDomain: 'idm-d.openx.net' }}, benefit, happen, open, order, profit), then the consonant is not doubled. Other verbs which are often misspelt in this way are: bother, complain, consider, join, recover, remain. { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_btmslot' }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776142', position: 'btf' }}, 'cap': true { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_mpuslot3' }}]}, } { bidder: 'sovrn', params: { tagid: '448840' }},