1) How many lessons do the boys have?
2) How many lessons does she have?
3) How many .... does Jane have? (непонятно, что есть у Джейн)
4) How many books do the pupils have?
5) How many envelopes does Sam have?
6) How many boxes do you have?
Или британский вариант:
1) How many lessons have the boys got?
2) How many lessons has she got?
3) How many .... has Jane got?
4) How many books have the pupils got?
5) How many envelopes has Sam got?
6) How many boxes have you got?