Planks or lays down, how to write correctly, which rule?
At the root with alternating e-i (in this case stele-style), the letter "I" is written if the suffix -a- is after the root. The letters "E" are written when the suffix - is not present. For example: with the letter "and" - takes away, lights up, freezes. With the letter "E" - will take away, lock, shine. This means that in the word "carpeted" in the unstressed position we write "I", since after the root there is the suffix -a-.
In this case, it is necessary to apply the spelling rule with alternating vowels in the root -style - stele-: if there is a suffx A after the root, you should write in the root I: spreads, spreads, covers; if there is no suffix A, then the root is written E: spread, bed, cover.