Solution: Five Saturdays, with four complete weeks in the middle, means: 7×4=28 (days),

According to the calculation of 3 1 day per month, (1) the first day is Wednesday and the last day is Saturday.

(2) The first day is Thursday and the last day is Sunday.

The first day is Saturday and the last day is Tuesday.

According to the calculation of 30 days per month, (1) the first day is Thursday and the last day is Saturday.

The first day is Friday and the last day is Sunday.

According to the leap year of 29 days, (1) the first day is Friday and the last day is Saturday.

(2) The first day is Saturday and the last day is Sunday.

If the leap year is 28 days, (1) the first day is Saturday and the last day is Saturday.

So: there will be the above eight situations.