Many a / more than one…

Many a, more than one + singular verb.

• Many a day has been passed in leisurely reading.
• More than one error was discovered in the wording of the document. 

When a noun phrase contains more than one and a singular noun, the verb is normally singular.

• There is more than one way to skin a cat.
• More than one editor is working on that project.
• More than one field has been planted with oats.

When more than one is followed by of and a plural noun, the verb is plural.

• More than one of the paintings were stolen.
• More than one of the cottages are for sale.

When more than one stands alone, it usually takes a singular verb, but it may take a plural verb if the notion of multiplicity predominates.

• The operating rooms are all in good order. More than one is (or are) equipped with the latest imaging technology.

More than two, etc + plural.

• More than two mistakes have been made.