[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"grammar-exercise-01a01413-9e1c-793d-903b-9095acdc26d6":3,"grammar-exercise-lesson-019b84b5-2659-784a-9965-86ec3a2f4271":263},["Reactive",4],{"id":5,"grammarPage":6,"title":7,"instructions":8,"displayOrder":9,"type":10,"questions":11,"ogImageUrl":262},"01a01413-9e1c-793d-903b-9095acdc26d6","\u002Fapi\u002Fgrammar_pages\u002F019b84b5-2659-784a-9965-86ec3a2f4271","Must and Can't - Find and Fix","One word in each sentence is wrong. Tap it, then choose the correction.",4,"find_and_fix",[12,38,63,89,109,124,144,163,185,206,222,242],{"id":13,"sentenceTemplate":14,"displayOrder":15,"explanation":16,"exampleSentence":17,"blanks":18,"payload":19},"01a01413-9e1c-7a91-903b-9095ad28dca0","Two oven timers read DONE, so the meals can't be ready.",0,"Use “must be” for a strong positive deduction from the timer evidence.","Two oven timers read DONE, so the meals must be ready.",[],{"hint":20,"words":21,"correct":33,"wrongIndex":34,"corrections":35},"The two timer displays provide strong evidence that the meals are ready.",[22,23,24,25,26,27,28,29,30,31,32],"Two","oven","timers","read","DONE,","so","the","meals","can't","be","ready.","must",8,[33,36,37],"mustn't","couldn't",{"id":39,"sentenceTemplate":40,"displayOrder":41,"explanation":42,"exampleSentence":43,"blanks":44,"payload":45},"01a01413-9e1c-7af9-903b-9095ae10af44","The live log shows fresh keystrokes, so Priya must be type inside the lab.",1,"Use “must be typing” for a strong deduction about an activity happening now.","The live log shows fresh keystrokes, so Priya must be typing inside the lab.",[],{"hint":46,"words":47,"correct":58,"wrongIndex":59,"corrections":60},"The live log shows an action in progress.",[48,49,50,51,52,53,27,54,33,31,55,56,28,57],"The","live","log","shows","fresh","keystrokes,","Priya","type","inside","lab.","typing",10,[58,61,62],"types","writes",{"id":64,"sentenceTemplate":65,"displayOrder":66,"explanation":67,"exampleSentence":68,"blanks":69,"payload":70},"01a01413-9e1c-7b39-903b-9095aeccc5c3","Iris must have went into the secure room; her fingerprint is in the log.",2,"A past deduction uses “must have” plus the past participle “gone”, not the past form “went”.","Iris must have gone into the secure room; her fingerprint is in the log.",[],{"hint":71,"words":72,"correct":84,"wrongIndex":85,"corrections":86},"The fingerprint is evidence about a completed past action.",[73,33,74,75,76,28,77,78,79,80,81,82,28,83],"Iris","have","went","into","secure","room;","her","fingerprint","is","in","log.","gone",3,[84,87,88],"going","go",{"id":90,"sentenceTemplate":91,"displayOrder":85,"explanation":92,"exampleSentence":93,"blanks":94,"payload":95},"01a01413-9e1c-7b6d-903b-9095aedc7da6","The live feed shows Leila at the easel, so she must have painting now.","For a present activity in progress, use “must be painting”. “Must have” introduces a past deduction and cannot stand directly before “painting”.","The live feed shows Leila at the easel, so she must be painting now.",[],{"hint":96,"words":97,"correct":31,"wrongIndex":105,"corrections":106},"The live feed shows an activity in progress now, not an earlier activity.",[48,49,98,51,99,100,28,101,27,102,33,74,103,104],"feed","Leila","at","easel,","she","painting","now.",11,[31,107,108],"has","been",{"id":110,"sentenceTemplate":111,"displayOrder":9,"explanation":112,"exampleSentence":113,"blanks":114,"payload":115},"01a01413-9e1c-7ba1-903b-9095afad19b7","Ana mustn't be at home; the live camera shows her at work.","Use “can’t be” for a negative deduction; “mustn’t” normally expresses prohibition.","Ana can't be at home; the live camera shows her at work.",[],{"hint":116,"words":117,"correct":30,"wrongIndex":41,"corrections":122},"The live picture makes her being at home impossible.",[118,36,31,100,119,28,49,120,51,79,100,121],"Ana","home;","camera","work.",[30,33,123],"might",{"id":125,"sentenceTemplate":126,"displayOrder":127,"explanation":128,"exampleSentence":129,"blanks":130,"payload":131},"01a01413-9e1c-7bd1-903b-9095afe28329","The stage is empty, so the actors can't be rehearse there.",5,"Use “can’t be” plus the -ing form “rehearsing” for an impossible activity happening now.","The stage is empty, so the actors can't be rehearsing there.",[],{"hint":132,"words":133,"correct":139,"wrongIndex":140,"corrections":141},"The empty stage rules out an action in progress.",[48,134,81,135,27,28,136,30,31,137,138],"stage","empty,","actors","rehearse","there.","rehearsing",9,[139,142,143],"rehearses","perform",{"id":145,"sentenceTemplate":146,"displayOrder":147,"explanation":148,"exampleSentence":149,"blanks":150,"payload":151},"01a01413-9e1c-7c05-903b-9095b07f4738","The courier can't has removed the documents; the parcel is still sealed.",6,"A modal takes the base form “have”, so the past negative deduction is “can’t have removed”.","The courier can't have removed the documents; the parcel is still sealed.",[],{"hint":152,"words":153,"correct":74,"wrongIndex":85,"corrections":160},"The unbroken seal rules out a completed past action.",[48,154,30,107,155,28,156,28,157,81,158,159],"courier","removed","documents;","parcel","still","sealed.",[74,161,162],"had","having",{"id":164,"sentenceTemplate":165,"displayOrder":166,"explanation":167,"exampleSentence":168,"blanks":169,"payload":170},"01a01413-9e1c-7c35-903b-9095b158311b","At noon, they were at their desks, so they can't have been drive.",7,"Use “can’t have been driving” for an activity that could not have been in progress then.","At noon, they were at their desks, so they can't have been driving.",[],{"hint":171,"words":172,"correct":180,"wrongIndex":181,"corrections":182},"Their location at their desks at noon rules out an activity in progress elsewhere then.",[173,174,175,176,100,177,178,27,175,30,74,108,179],"At","noon,","they","were","their","desks,","drive.","driving.",12,[180,183,184],"drove.","drives.",{"id":186,"sentenceTemplate":187,"displayOrder":34,"explanation":188,"exampleSentence":189,"blanks":190,"payload":191},"01a01413-9e1c-7c65-903b-9095b23ddb11","The sign says NO ENTRY, so visitors mustn't entering this area.","Use the base verb after “mustn’t”, so the prohibition is “visitors mustn’t enter”.","The sign says NO ENTRY, so visitors mustn't enter this area.",[],{"hint":192,"words":193,"correct":202,"wrongIndex":34,"corrections":203},"Here the sign gives a prohibition, not a deduction.",[48,194,195,196,197,27,198,36,199,200,201],"sign","says","NO","ENTRY,","visitors","entering","this","area.","enter",[202,204,205],"enters","entered",{"id":207,"sentenceTemplate":208,"displayOrder":140,"explanation":209,"exampleSentence":210,"blanks":211,"payload":212},"01a01413-9e1c-7c99-903b-9095b32d94de","Do you think Dr Lee mustn't be inside? The live camera shows her there.","“Do you think” can introduce another person’s view; the camera evidence supports the positive deduction “must be inside”.","Do you think Dr Lee must be inside? The live camera shows her there.",[],{"hint":213,"words":214,"correct":33,"wrongIndex":127,"corrections":221},"The question asks for a positive deduction about Dr Lee from direct evidence.",[215,216,217,218,219,36,31,220,48,49,120,51,79,138],"Do","you","think","Dr","Lee","inside?",[33,30,37],{"id":223,"sentenceTemplate":224,"displayOrder":59,"explanation":225,"exampleSentence":226,"blanks":227,"payload":228},"01a01413-9e1c-7cc9-903b-9095b3fe36d4","Can the gallery really been open at midnight? It normally closes at five.","After the modal “can”, use the base form “be”: “Can the gallery really be open?”","Can the gallery really be open at midnight? It normally closes at five.",[],{"hint":229,"words":230,"correct":31,"wrongIndex":9,"corrections":240},"This is a surprised question about a present possibility.",[231,28,232,233,108,234,100,235,236,237,238,100,239],"Can","gallery","really","open","midnight?","It","normally","closes","five.",[31,241,81],"being",{"id":243,"sentenceTemplate":244,"displayOrder":105,"explanation":245,"exampleSentence":246,"blanks":247,"payload":248},"01a01413-9e1c-7cf9-903b-9095b4d629a6","Could the night team have took the missing office key?","Use “could have” plus the past participle “taken” to ask about a possible past action.","Could the night team have taken the missing office key?",[],{"hint":249,"words":250,"correct":258,"wrongIndex":127,"corrections":259},"The missing key supports a past possibility question.",[251,28,252,253,74,254,28,255,256,257],"Could","night","team","took","missing","office","key?","taken",[258,260,261],"taking","take","\u002Fuploads\u002Fimages\u002Fgpimg_656dc47d-3a61-4f41-8b37-f2ddbdfc6b0e_hero.webp",{"title":264,"slug":265,"language":266,"level":267},"Must and Can't (Deductions)","must-and-cant-dedcutions","en","B1"]