Posted by **rfvv** on Sunday, February 3, 2013 at 7:41pm.

1. In the first period, I have a class.

2. At the first period, I have a class.

3. On the first period, I have a class.

4. In the first period, I have class.

5. At the first period, I have class.

6. On the first period, I have class.

(Which ones are grammatical?)

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