Is it true that if the month of Sha'ban is thirty days, then Ramadan must be twenty-nine days, and that it is impossible for two consecutive lunar months to both be thirty days?

This statement is incorrect, for it has been proven through continuous observation that full months follow one another for thirty days. What some scholars have mentioned about the rarity of four consecutive months being all complete or all incomplete is contrary to what is correct, and there is no legal (Shar'i) evidence for it. It is obligatory to complete all months, even if the crescent moon is not sighted for long periods.