In French, when you give an order or a suggestion using a pronominal verb (reflexive verbs) in the affirmative imperative, the reflexive pronoun moves after the verb and is connected by a hyphen.
The pronouns change slightly in the "tu" form:
Examples:
Normally, for -ER verbs (and "aller"), the "s" is dropped in the tu form of the imperative. However, when the verb is followed by the pronouns en or y, we add an -s back to the verb. This is done solely to make the pronunciation smoother (avoiding a "clash" of two vowel sounds).
Examples:
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