In at least three or four places during the last month I have seen sentences that use the verb lead as if it were in the past tense, e.g.: What has lead to this sad state of affairs?
The verb lead, pronounced LEED, is in the present tense. Owing to some arcane philological shenanigans by the Anglo-Saxons, who adopted a few Germanic verb forms, the past tense of lead is irregular, and rather than leaded, it is led, pronounced LED.
The reason that lead is often used for and pronounced like led is twofold. First, there is a noun, lead, meaning a metal, that is spelled in the same way as the verb that is pronounced LEED, but is pronounced LED. Second, the verb lead is understandably confused with the verb read, whose irregular past tense is spelled the same, read, but is pronounced RED.
I do hope that you have now read enough to understand what has led to this confusion.
The Bard of Buffalo Bayou is always confused, but that is because of the gargantuan swigs of Chardonnay with which he surreptitiously spices up his dreary workdays.
The books I like to read
Are ones I’ve never read,
Until my eyes are red,
Though that is sure to lead,
As it has always led,
To eyes that feel like lead.