Câu 1: ______ will the concert last?  When  How many times  How long Câu 2: _____ did you complete this work?  When  How long  How many times Câu 3: '______ did you visit them last summer?' 'Almost every weekend.'  How long  When  How many times Câu 4: '______ do you go to the big supermarket to do your shopping?' 'Not very often. Perhaps once a month.'  How many times  When  How long Câu 5: _____ did you stay in India? 'twelve months'  How long  When  How many times Câu 6: ______ did Steve sign the contract?' 'two months ago'  When  How many times  How long Câu 7: _____have you been there? 'ten minutes'  How long  How many times  When Câu 8: '_______ can you stay?' 'Not much longer. For another ten minutes perhaps.  How many longer  How long  How longer  How much longer Câu 9: '______ did the phone ring last night?' 'We must have had about twenty calls.'  How long  How many times  When Câu 10: ______ was the last time you visit your grandparents? - About 2 years ago.  How many times  How long  When