[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"grammar-exercise-01a01413-9e5e-745f-989a-78b3bdf861b7":3,"grammar-exercise-lesson-019b84a8-b6cc-7649-b832-969ce8dd0933":240},["Reactive",4],{"id":5,"grammarPage":6,"title":7,"instructions":8,"displayOrder":9,"type":10,"questions":11,"ogImageUrl":239},"01a01413-9e5e-745f-989a-78b3bdf861b7","\u002Fapi\u002Fgrammar_pages\u002F019b84a8-b6cc-7649-b832-969ce8dd0933","Obligation - Find and Fix","One word in each sentence is wrong. Tap it, then choose the correction.",4,"find_and_fix",[12,36,54,81,115,139,158,174,196,219],{"id":13,"sentenceTemplate":14,"displayOrder":15,"explanation":16,"exampleSentence":17,"blanks":18,"payload":19},"01a01413-9e5e-77a3-989a-78b3bed3270d","Right now, every resident have to sort food waste.",0,"The present singular subject 'every resident' takes 'has to'. 'Right now' rules out the past form 'had to'.","Right now, every resident has to sort food waste.",[],{"hint":20,"words":21,"correct":31,"wrongIndex":9,"corrections":32},"Check agreement in the obligation phrase.",[22,23,24,25,26,27,28,29,30],"Right","now,","every","resident","have","to","sort","food","waste.","has",[31,33,34,35],"had","having","must",{"id":37,"sentenceTemplate":38,"displayOrder":39,"explanation":40,"exampleSentence":41,"blanks":42,"payload":43},"01a01413-9e5e-78eb-989a-78b3bef8c683","Does Lina has to collect her medicine today?",1,"After 'does', use the base form 'have': 'Does Lina have to ...?'","Does Lina have to collect her medicine today?",[],{"hint":44,"words":45,"correct":26,"wrongIndex":52,"corrections":53},"Check the form used after the question auxiliary.",[46,47,31,27,48,49,50,51],"Does","Lina","collect","her","medicine","today?",2,[26,33,34,35],{"id":55,"sentenceTemplate":56,"displayOrder":52,"explanation":57,"exampleSentence":58,"blanks":59,"payload":60},"01a01413-9e5e-7987-989a-78b3bf5ae738","My plan is to put money aside, so I must saves part of my salary.","A modal is followed by the base verb, so use 'must save' for this strong personal decision.","My plan is to put money aside, so I must save part of my salary.",[],{"hint":61,"words":62,"correct":76,"wrongIndex":77,"corrections":78},"Check the verb form after the modal.",[63,64,65,27,66,67,68,69,70,35,71,72,73,74,75],"My","plan","is","put","money","aside,","so","I","saves","part","of","my","salary.","save",10,[76,79,80],"saved","saving",{"id":82,"sentenceTemplate":83,"displayOrder":84,"explanation":85,"exampleSentence":86,"blanks":87,"payload":88},"01a01413-9e5e-7a27-989a-78b3c00b22df","The teacher allows extra copies and does not discourage them, but they are unnecessary, so students must print another copy.",3,"The teacher allows extra copies but does not require or discourage them, so use 'needn't'. 'Mustn't' and 'can't' would prohibit them, while 'shouldn't' would discourage them.","The teacher allows extra copies and does not discourage them, but they are unnecessary, so students needn't print another copy.",[],{"hint":89,"words":90,"correct":109,"wrongIndex":110,"corrections":111},"Decide whether this is prohibition or no necessity.",[91,92,93,94,95,96,97,98,99,100,101,102,103,104,69,105,35,106,107,108],"The","teacher","allows","extra","copies","and","does","not","discourage","them,","but","they","are","unnecessary,","students","print","another","copy.","needn't",16,[109,112,113,114],"mustn't","can't","shouldn't",{"id":116,"sentenceTemplate":117,"displayOrder":9,"explanation":118,"exampleSentence":119,"blanks":120,"payload":121},"01a01413-9e5e-7abb-989a-78b3c0db0ba5","A red camera symbol has a line through it, so visitors must take pictures.","The crossed-out camera symbol indicates prohibition, so use 'mustn't'. 'Needn't' removes necessity, while 'can' and 'may' give permission.","A red camera symbol has a line through it, so visitors mustn't take pictures.",[],{"hint":122,"words":123,"correct":112,"wrongIndex":135,"corrections":136},"Use the sign to identify the kind of rule.",[124,125,126,127,31,128,129,130,131,69,132,35,133,134],"A","red","camera","symbol","a","line","through","it,","visitors","take","pictures.",11,[112,109,137,138],"can","may",{"id":140,"sentenceTemplate":141,"displayOrder":142,"explanation":143,"exampleSentence":144,"blanks":145,"payload":146},"01a01413-9e5e-7b4f-989a-78b3c171f8f5","Yesterday, drivers have to pay the city toll.",5,"Use 'had to' for an obligation in the past. 'Yesterday' fixes the time.","Yesterday, drivers had to pay the city toll.",[],{"hint":147,"words":148,"correct":33,"wrongIndex":52,"corrections":155},"Check the time of the obligation.",[149,150,26,27,151,152,153,154],"Yesterday,","drivers","pay","the","city","toll.",[33,35,156,157],"will","need",{"id":159,"sentenceTemplate":160,"displayOrder":161,"explanation":162,"exampleSentence":163,"blanks":164,"payload":165},"01a01413-9e5e-7bb3-989a-78b3c22fbbc1","Next month, cafés will has to label every bin.",6,"Use 'will have to' for a future obligation. After 'will', use the base form 'have'.","Next month, cafés will have to label every bin.",[],{"hint":166,"words":167,"correct":26,"wrongIndex":9,"corrections":173},"Check the verb form after will.",[168,169,170,156,31,27,171,24,172],"Next","month,","cafés","label","bin.",[26,33,34,35],{"id":175,"sentenceTemplate":176,"displayOrder":177,"explanation":178,"exampleSentence":179,"blanks":180,"payload":181},"01a01413-9e5e-7c0b-989a-78b3c23024f5","Nora's pass is valid, so she doesn't needs to show it again.",7,"After 'doesn't', use the base form 'need': Nora doesn't need to show it again.","Nora's pass is valid, so she doesn't need to show it again.",[],{"hint":182,"words":183,"correct":157,"wrongIndex":177,"corrections":193},"Check the form used after doesn't.",[184,185,65,186,69,187,188,189,27,190,191,192],"Nora's","pass","valid,","she","doesn't","needs","show","it","again.",[157,194,195,35],"needed","needing",{"id":197,"sentenceTemplate":198,"displayOrder":199,"explanation":200,"exampleSentence":201,"blanks":202,"payload":203},"01a01413-9e5e-7c67-989a-78b3c326edd9","The venue sets the rule, so all vendors must submits an insurance form.",8,"After 'must', use the base verb 'submit'. The past and -ing forms cannot follow the modal in this structure.","The venue sets the rule, so all vendors must submit an insurance form.",[],{"hint":61,"words":204,"correct":214,"wrongIndex":215,"corrections":216},[91,205,206,152,207,69,208,209,35,210,211,212,213],"venue","sets","rule,","all","vendors","submits","an","insurance","form.","submit",9,[214,217,218],"submitted","submitting",{"id":220,"sentenceTemplate":221,"displayOrder":215,"explanation":222,"exampleSentence":223,"blanks":224,"payload":225},"01a01413-9e5e-7cbf-989a-78b3c3e60796","Have Niko got to leave for work now?","The informal present question is 'Has Niko got to leave for work now?' The singular subject takes 'has'; the other auxiliaries cannot stand before 'got to' in this question.","Has Niko got to leave for work now?",[],{"hint":226,"words":227,"correct":235,"wrongIndex":15,"corrections":236},"Check agreement in the informal question.",[228,229,230,27,231,232,233,234],"Have","Niko","got","leave","for","work","now?","Has",[235,46,237,238],"Did","Must","\u002Fuploads\u002Fimages\u002Fgpimg_fc099e13-05b1-44b8-8de0-1a78a3a610bd_hero.webp",{"title":241,"slug":242,"language":243,"level":244},"Must\u002Fhave to (Modals)","musthave-to-modals","en","B1"]