{ bidder: 'appnexus', params: { placementId: '11654149' }}, { bidder: 'openx', params: { unit: '539971080', delDomain: 'idm-d.openx.net' }}, simple present|main clause is in the simple present, signal words: every day; When Kylie went to school, she (pick up) by her parents every day. {code: 'ad_topslot_b', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[728, 90]] } }, iasLog("setting page_url: - https://dictionary.cambridge.org/grammar/british-grammar/perfect-infinitive-with-to-to-have-worked"); }; Click here to learn about irregular verbs. ga('send', 'pageview'); Add ${headword} to one of your lists below, or create a new one. googletag.cmd.push(function() { // FIXME: (temporary) - send ad requests only if PlusPopup is not shown I am glad to have found a new job. { bidder: 'onemobile', params: { dcn: '8a9690ab01717182962182bb50ce0007', pos: 'cdo_btmslot_mobile_flex' }}, googletag.pubads().setTargeting("cdo_pc", "dictionary"); (passive continuous infinitive, rarely used) This sonnet must have been written by Shakespeare. }], { bidder: 'openx', params: { unit: '539971063', delDomain: 'idm-d.openx.net' }}, Bell wrote the books' sound clumsy), I was surprised by how well the students did in the test. { bidder: 'onemobile', params: { dcn: '8a9690ab01717182962182bb50ce0007', pos: 'cdo_topslot_mobile_flex' }}, dfpSlots['rightslot'] = googletag.defineSlot('/2863368/rightslot', [[300, 250]], 'ad_rightslot').defineSizeMapping(mapping_rightslot).setTargeting('sri', '0').setTargeting('vp', 'mid').setTargeting('hp', 'right').addService(googletag.pubads()); dfpSlots['houseslot_b'] = googletag.defineSlot('/2863368/houseslot', [], 'ad_houseslot_b').defineSizeMapping(mapping_houseslot_b).setTargeting('sri', '0').setTargeting('vp', 'btm').setTargeting('hp', 'center').setCategoryExclusion('house').addService(googletag.pubads()); { bidder: 'appnexus', params: { placementId: '11654208' }}, { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_HDX' }}, { bidder: 'ix', params: { siteId: '195465', size: [300, 250] }}, I am struck. { bidder: 'openx', params: { unit: '539971066', delDomain: 'idm-d.openx.net' }}, { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_btmslot' }}]}]; Usage explanations of natural written and spoken English, 0 && stateHdr.searchDesk ? { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_leftslot' }}, var dfpSlots = {}; The door must be locked at all times. 'min': 31, iasLog("criterion : cdo_ei = perfect-infinitive-with-to-to-have-worked"); Passive: I thought that John had been kissed by Mary. { bidder: 'ix', params: { siteId: '194852', size: [300, 250] }}, {code: 'ad_btmslot_a', pubstack: { adUnitName: 'cdo_btmslot', adUnitPath: '/2863368/btmslot' }, mediaTypes: { banner: { sizes: [[300, 250]] } }, userSync: { dfpSlots['houseslot_a'] = googletag.defineSlot('/2863368/houseslot', [300, 250], 'ad_houseslot_a').defineSizeMapping(mapping_houseslot_a).setTargeting('sri', '0').setTargeting('vp', 'mid').setTargeting('hp', 'right').setCategoryExclusion('house').addService(googletag.pubads()); 'increment': 1, type: "cookie", { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_Billboard' }}, { bidder: 'appnexus', params: { placementId: '11654157' }}, It can refer to events which did happen in the past or to events that might have happened (but did not happen): 'buckets': [{ bidderSequence: "fixed" var pbAdUnits = getPrebidSlots(curResolution); pid: '94' { bidder: 'sovrn', params: { tagid: '446381' }}, { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_SR' }}, ga('create', 'UA-31379-3',{cookieDomain:'dictionary.cambridge.org',siteSpeedSampleRate: 10}); { bidder: 'openx', params: { unit: '539971063', delDomain: 'idm-d.openx.net' }}, iasLog("criterion : cdo_dc = british-grammar"); Three books are used regularly in the class. The corporation may have been sold last week. Passive: I thought that John had been kissed by Mary. type: "html5", { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_btmslot' }}]}]; },{ In (a): The snow seems now to have stopped a few minutes ago. bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776156', position: 'atf' }}, This can happen for lots of reasons (see the explanation further down the page). { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_btmslot' }}, { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, } Get more Perfect English Grammar with our courses. name: "unifiedId", { bidder: 'appnexus', params: { placementId: '11653860' }}, var mapping_rightslot = googletag.sizeMapping().addSize([746, 0], [[300, 250]]).addSize([0, 0], []).build(); partner: "uarus31" dfpSlots['topslot_b'] = googletag.defineSlot('/2863368/topslot', [[728, 90]], 'ad_topslot_b').defineSizeMapping(mapping_topslot_b).setTargeting('sri', '0').setTargeting('vp', 'top').setTargeting('hp', 'center').addService(googletag.pubads()); var mapping_houseslot_b = googletag.sizeMapping().addSize([963, 0], []).addSize([0, 0], [300, 250]).build(); Welcome! storage: { { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_leftslot' }}, googletag.pubads().set("page_url", "https://dictionary.cambridge.org/grammar/british-grammar/perfect-infinitive-with-to-to-have-worked"); params: { iasLog("criterion : sfr = cdo_dict_british-grammar"); { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_btmslot' }}]}]; { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_topslot' }}, Type the verbs in the correct tense, in the passive. { bidder: 'sovrn', params: { tagid: '346693' }}, { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_topslot' }}, Active: I thought that Mary had kissed John. { bidder: 'ix', params: { siteId: '194852', size: [300, 250] }}, { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_SR' }}, { bidder: 'ix', params: { siteId: '195451', size: [320, 50] }}, } googletag.pubads().setCategoryExclusion('mcp').setCategoryExclusion('resp').setCategoryExclusion('wprod'); Perfect infinitive. {code: 'ad_rightslot', pubstack: { adUnitName: 'cdo_rightslot', adUnitPath: '/2863368/rightslot' }, mediaTypes: { banner: { sizes: [[300, 250]] } }, I would have gone on a … Some verbs that have two objects can make two different active sentences, and so two different passive sentences too: "error": true, { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_Billboard' }}, { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, (passive perfect infinitive) Luis is driving around in a new car. initAdSlotRefresher(); { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_topslot' }}]}, if(!isPlusPopupShown()) { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_leftslot' }}]}, You should have telephoned – I was getting worried. Passive perfect infinitive: to have + been + past participle This sonnet seemsto have been writtenby Shakespeare. { bidder: 'appnexus', params: { placementId: '11654156' }}, (More natural than: 'how well the students did in the test surprised me'). { bidder: 'sovrn', params: { tagid: '346688' }}, googletag.pubads().collapseEmptyDivs(false); {code: 'ad_btmslot_a', pubstack: { adUnitName: 'cdo_btmslot', adUnitPath: '/2863368/btmslot' }, mediaTypes: { banner: { sizes: [[300, 250], [320, 50], [300, 50]] } }, { bidder: 'sovrn', params: { tagid: '446381' }}, expires: 365 { bidder: 'ix', params: { siteId: '195466', size: [728, 90] }}, { bidder: 'sovrn', params: { tagid: '387232' }}, }, { bidder: 'sovrn', params: { tagid: '346693' }}, var mapping_btmslot_a = googletag.sizeMapping().addSize([746, 0], [[300, 250], 'fluid']).addSize([0, 0], [[300, 250], [320, 50], [300, 50], 'fluid']).build();

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