If you wish to give your students points if they enter punctuation or not at the end of a sentence, you will have to add both options as correct answers.

For instance, in the question below, the correct answer is "to be here". (without punctuation)

If students enter "to be here." (with punctuation) they will not be given points.

To allow this, add both options "to be here" and "to be here." as correct answers when creating/editing the exam.