plural form of word thesis

Some rules in English defy explanation. Here are some common thorny spellings for plural forms that you should always double-check.
The rules of English spelling can bewilder even the most seasoned communicator.

To be specific, you can say, “Three of the punctuation marks in your essay are incorrect,” or “Please go through and correct the punctuation in your essay.”
You could say to someone, “You have a problem using correct punctuation,” and this would be a general reference to a person’s writing.

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References:

http://socratic.org/questions/what-is-the-plural-form-of-the-word-punctuation
http://study.com/academy/answer/what-is-the-plural-form-of-axis.html
http://study.com/academy/answer/what-is-the-plural-of-thesis.html