[ Grammar ]
John doesn’t know how_________the computer on.
A. to switch
B. switching
C. to switching
D. to have switched

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Tenses, Determiners & Subject Verb AgreementGrammar- Later/LatterModal "Have to"There is or There areComplex PrepositionsModals and PhrasesPresent Continuos TensePresent tense AffirmativePresent Tenses and VocabularyPast Continuous Tense & Past ModalsOther quiz:
Adverbial Clause › ViewHe stayed behind _____ he could help clean up.
A. in case
B. unless
C. so that
D. while
Grammar › View
Over a thousand people ………. (lose) all their money on the stock exchange last month.
A. Loose
B. Were losing
C. Have lost
D. Lost
There are always regional __________ in every country.
A. differs
B. different
C. differences
Modals › View
You ___________ send text messages when you are driving.
A. haven’t
B. hasn’t
C. should
D. mustn’t