[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"grammar-exercise-019faa5f-8781-780f-bcd1-35b57fb73335":3,"grammar-exercise-lesson-019b84a8-b6cc-7649-b832-969ce8dd0933":165},["Reactive",4],{"id":5,"grammarPage":6,"title":7,"instructions":8,"displayOrder":9,"type":10,"questions":11,"ogImageUrl":164},"019faa5f-8781-780f-bcd1-35b57fb73335","\u002Fapi\u002Fgrammar_pages\u002F019b84a8-b6cc-7649-b832-969ce8dd0933","Build Obligation Source and Time","Tap the words in the correct order to build each sentence. Contrast speaker-driven must with external have to, and use the correct agreement or past form. One word does not belong.",2,"sentence_builder",[12,31,45,59,74,89,104,119,134,149],{"id":13,"sentenceTemplate":14,"displayOrder":15,"explanation":16,"exampleSentence":17,"blanks":18},"019fc2c4-a598-7412-ab48-1ef101f782ba","Build the sentence: __1__",0,"'Must' presents calling as the speaker's own strong reminder.","I must reply to Leo tonight.",[19],{"id":20,"blankNumber":21,"options":22},"019fc2c4-a598-738a-ab48-1ef101e3950f",1,[23,27],{"id":24,"optionText":25,"isCorrect":26,"displayOrder":15},"019fc2c4-a598-72ce-ab48-1ef101423b8d","calls",false,{"id":28,"optionText":29,"isCorrect":30,"displayOrder":21},"019fc2c4-a598-733e-ab48-1ef101df8598","I must call my grandmother tonight.",true,{"id":32,"sentenceTemplate":14,"displayOrder":21,"explanation":33,"exampleSentence":34,"blanks":35},"019fc2c4-a598-75b6-ab48-1ef104e73457","'Must' expresses the speakers' urgent decision to leave before they miss the train.","We must hurry or we will be late.",[36],{"id":37,"blankNumber":21,"options":38},"019fc2c4-a598-7546-ab48-1ef10416c102",[39,42],{"id":40,"optionText":41,"isCorrect":30,"displayOrder":15},"019fc2c4-a598-74ba-ab48-1ef102accb23","We must leave now or we will miss the train.",{"id":43,"optionText":44,"isCorrect":26,"displayOrder":21},"019fc2c4-a598-7506-ab48-1ef103a69762","leaves",{"id":46,"sentenceTemplate":14,"displayOrder":9,"explanation":47,"exampleSentence":48,"blanks":49},"019fc2c4-a598-772a-ab48-1ef107f98ac5","'Must' can express the speaker's strong, enthusiastic recommendation.","You must visit the new gallery; it is wonderful.",[50],{"id":51,"blankNumber":21,"options":52},"019fc2c4-a598-76c2-ab48-1ef10782c28b",[53,56],{"id":54,"optionText":55,"isCorrect":26,"displayOrder":15},"019fc2c4-a598-763a-ab48-1ef105cfd3bc","tries",{"id":57,"optionText":58,"isCorrect":30,"displayOrder":21},"019fc2c4-a598-767e-ab48-1ef106bf588c","You must try the soup; it is delicious.",{"id":60,"sentenceTemplate":14,"displayOrder":61,"explanation":62,"exampleSentence":63,"blanks":64},"019fc2c4-a598-789a-ab48-1ef109fedf46",3,"The workplace rule is an external obligation, and 'I' takes 'have to'.","I have to show my badge at work.",[65],{"id":66,"blankNumber":21,"options":67},"019fc2c4-a598-782e-ab48-1ef109e333d1",[68,71],{"id":69,"optionText":70,"isCorrect":30,"displayOrder":15},"019fc2c4-a598-77aa-ab48-1ef107ff1275","I have to wear safety boots at work.",{"id":72,"optionText":73,"isCorrect":26,"displayOrder":21},"019fc2c4-a598-77ee-ab48-1ef108fb9f77","wears",{"id":75,"sentenceTemplate":14,"displayOrder":76,"explanation":77,"exampleSentence":78,"blanks":79},"019fc2c4-a598-7a0a-ab48-1ef10ba504b2",4,"A deadline creates an external requirement. Put singular 'Maya' before 'has to', use the base verb 'submit', and place 'by Friday' last.","Leo has to return the form by Monday.",[80],{"id":81,"blankNumber":21,"options":82},"019fc2c4-a598-799e-ab48-1ef10b82bf60",[83,86],{"id":84,"optionText":85,"isCorrect":26,"displayOrder":15},"019fc2c4-a598-791a-ab48-1ef10a17dac3","submits",{"id":87,"optionText":88,"isCorrect":30,"displayOrder":21},"019fc2c4-a598-795e-ab48-1ef10b0a538a","Maya has to submit the form by Friday.",{"id":90,"sentenceTemplate":14,"displayOrder":91,"explanation":92,"exampleSentence":93,"blanks":94},"019fc2c4-a598-7b8e-ab48-1ef10e09fe23",5,"The entry rule applies to plural 'employees'. Put 'have to' after the subject, use the base verb 'scan', and place the entrance phrase last.","Visitors have to leave their bags at reception.",[95],{"id":96,"blankNumber":21,"options":97},"019fc2c4-a598-7b26-ab48-1ef10d33dc04",[98,101],{"id":99,"optionText":100,"isCorrect":30,"displayOrder":15},"019fc2c4-a598-7a9a-ab48-1ef10c6ad56a","Employees have to scan their badges at the entrance.",{"id":102,"optionText":103,"isCorrect":26,"displayOrder":21},"019fc2c4-a598-7ade-ab48-1ef10d01c544","scanned",{"id":105,"sentenceTemplate":14,"displayOrder":106,"explanation":107,"exampleSentence":108,"blanks":109},"019fc2c4-a598-7d02-ab48-1ef10f9fc08d",6,"The timetable is the outside source. In its result clause, put 'Leo has to' before the base verb 'catch' and its object.","The schedule means Ava has to arrive early.",[110],{"id":111,"blankNumber":21,"options":112},"019fc2c4-a598-7c96-ab48-1ef10f102bca",[113,116],{"id":114,"optionText":115,"isCorrect":26,"displayOrder":15},"019fc2c4-a598-7c0e-ab48-1ef10e1cfa89","caught",{"id":117,"optionText":118,"isCorrect":30,"displayOrder":21},"019fc2c4-a598-7c56-ab48-1ef10e2d7d81","The timetable means Leo has to catch the early bus.",{"id":120,"sentenceTemplate":14,"displayOrder":121,"explanation":122,"exampleSentence":123,"blanks":124},"019fc2c4-a598-7e72-ab48-1ef110628f87",7,"Put 'Yesterday' first with a comma; then use 'I had to' followed by the base verb 'replace'.","Yesterday, we had to repair the front door.",[125],{"id":126,"blankNumber":21,"options":127},"019fc2c4-a598-7e06-ab48-1ef11059fdf3",[128,131],{"id":129,"optionText":130,"isCorrect":30,"displayOrder":15},"019fc2c4-a598-7d82-ab48-1ef11002a9ca","Yesterday, I had to replace a flat tyre.",{"id":132,"optionText":133,"isCorrect":26,"displayOrder":21},"019fc2c4-a598-7dc6-ab48-1ef1101fc82a","replaced",{"id":135,"sentenceTemplate":14,"displayOrder":136,"explanation":137,"exampleSentence":138,"blanks":139},"019fc2c4-a599-703f-960a-26e122f5318b",8,"Put the past cause first, then the result after the comma: subject + 'had to' + base verb 'turn back'.","The bridge was closed, so they had to take another road.",[140],{"id":141,"blankNumber":21,"options":142},"019fc2c4-a598-7f76-ab48-1ef11243f3b3",[143,146],{"id":144,"optionText":145,"isCorrect":26,"displayOrder":15},"019fc2c4-a598-7eee-ab48-1ef110a4476e","turned",{"id":147,"optionText":148,"isCorrect":30,"displayOrder":21},"019fc2c4-a598-7f36-ab48-1ef11158e486","The storm closed the road, so we had to turn back.",{"id":150,"sentenceTemplate":14,"displayOrder":151,"explanation":152,"exampleSentence":153,"blanks":154},"019fc2c4-a599-71b7-960a-26e125abb078",9,"After 'did not', use the base form 'have', not 'had'; put the finished past time at the end.","Ben did not have to travel last weekend.",[155],{"id":156,"blankNumber":21,"options":157},"019fc2c4-a599-714b-960a-26e124d79033",[158,161],{"id":159,"optionText":160,"isCorrect":30,"displayOrder":15},"019fc2c4-a599-70c7-960a-26e12344daaa","Nora did not have to work last Saturday.",{"id":162,"optionText":163,"isCorrect":26,"displayOrder":21},"019fc2c4-a599-710b-960a-26e1243d9f3c","had","\u002Fuploads\u002Fimages\u002Fgpimg_cec4ebdb-bb79-4927-898b-50bc3eeaeb90_hero.webp",{"title":166,"slug":167,"language":168,"level":169},"Must\u002Fhave to (Modals)","musthave-to-modals","en","B1"]