past tense of misplace is misplaced.

What is considered present tense?

The PRESENT TENSE indicates that an action is present, now, relative to the speaker or writer. Generally, it is used to describe actions that are factual or habitual -- things that occur in the present but that are not necessarily happening right now: "It rains a lot in Portland" is a kind of timeless statement.

Is slipped past or present?

The past tense is slipped.